The following is an excerpt from Alonzo Mourning's autobiography, "Resilience: Faith, Focus, Triumph"

Your life can change in a single instant, at the most unexpected time in the most routine manner. One second you have a list of concerns and challenges and plans to deal with. The next second that all seems trivial and God is laying down a challenge—a challenge you never saw coming.

Mine came courtesy of a ringing telephone while I was asleep. I was taking a rare midday nap. Unless it was a game day, I was the last guy to spend the afternoon sleeping, especially with another NBA season to prepare for. But I was exhausted, suffering from what I believed was a combination of a lingering flu and extreme jet lag.

At my doctor’s suggestion I had gone in for some medical tests, a precautionary biopsy, but I didn’t believe anything serious was wrong, maybe a thyroid condition, or a virus. Maybe I was just ignoring the signs, but I really wasn’t very concerned. At worst, I figured, I’d take some pills and get back to getting ready for the fast- approaching NBA season, one in which I had my eyes on winning the championship.

After all, I was the healthiest person I knew—thirty years old, six foot ten, 255 pounds with just six percent body fat. I benched over three hundred pounds with ease. I worked out with hundred- pound dumbbells. I was a professional athlete, coming off a season where I was first team All NBA, a runner-up for NBA Most Valuable Player. That summer I had been named USA Basketball Player of the Year after we won gold at the Sydney Olympics. With defense as my specialty, my reputation as a player was as perhaps the toughest and hardest- working one in the entire league.

At that point, in September of 2000, I felt invincible, like I could leap tall buildings. Nothing ever fazed me. I kept telling myself, even after my doctor had suggested those tests, that I was just under the weather, the understandable fallout of recent events in my life. A grueling NBA season had led straight into summer with the Olympic team. At the same time, life at home was blessed but hectic.

My wife, Tracy, was pregnant with our second child, and part of the deal I made with her was that I could fulfill my dream of being an Olympian as long as I promised to make it back for the birth.

I tend to push things and believe everything will work out, so we had looked at the Olympic basketball schedule, found a couple of open days and decided to have the labor induced on a Saturday right in the middle of the games. That way, I could fly back to Miami with my mother- in- law and my first son, Trey, be at the birth, and then fly back to Australia and not miss a single game. USA Basketball was on board with the plan and NBC was even going to send a camera crew along. Nothing makes for great television like a new baby. It was all set.

But two days before the induction, the baby decided to come anyway. My wife started feeling labor pains and was in the shower singing to her, "Baby girl, wait for Daddy. Wait for Nana and your big brother." By the time she got out of the shower, though, she knew she couldn’t wait.

She called me and said, "Look, it’s time; it’s coming." I dropped everything. We grabbed the next flight from Sydney to Los Angeles— fourteen hours in the air—and then jumped on a plane from L.A. to Miami, which is six more hours. The trip from L.A. came on the private jet of the owner of the Miami Heat; if he hadn’t been so gracious, we probably wouldn’t have made it.

That trip seemed to take forever. The last few hours, my wife was in the delivery room still singing to the baby to "wait for Daddy, wait for Daddy," but it was getting close. We finally showed up, I went racing in and my wife was just bawling because she couldn’t believe we had made it. Within half an hour Myka Sydney—named after the town hosting the Olympics—was born.

It was one of the greatest moments of my life, holding this little baby girl in my big hands and gaining that immediate love that only being a parent can provide. I was so overwhelmed I forgot to even be tired.

Talk about a whirlwind. I have so much faith in God, I never worried that I would miss the birth. It seemed perfectly reasonable to me that I arrived from the other side of the world, camera crew in tow, with twenty- five minutes to spare. We all spent a great night together and then, less than twenty-four hours after reaching Tracy, I headed back to Australia where I arrived just in time for the medal rounds. I was exhausted but managed to play well. We won the gold, and my lifelong dream was fulfilled.

I returned to Miami and a house with a newborn, which isn’t conducive to sleeping off jet lag. All things considered, I kept telling myself, I had every right to be tired.

I was being naïve, of course. This was more than jet lag. The truth is I had been fatigued all summer. Later my doctors couldn’t believe I was even walking around, let alone winning a gold medal. My cholesterol level alone was between 500 and 600.

I was fidgety and my muscles were taking on more water than usual. One day at the Olympics I was getting stretched out and my leg looked swollen. I pushed into the leg and it left an indentation. I said to the trainer, "What the heck is this?" He told me I needed to get it checked out. But still, I was so unconcerned I never even told Tracy about it. She was busy with the baby, anyway, and I just thought, this is nothing.

Back in Miami, I decided to go to the hospital for some tests. My agent, Jeff Wechsler, was driving when I passed out in the passenger seat. I had a temperature of 104. I was very weak and depleted. But it still didn’t dawn on me how sick I was. I wouldn’t allow myself to admit it.

I had training camp coming up and I knew the physical challenges ahead would be brutal. Which is why the voice of my doctor, Victor Richards, on the phone the next day made me sit up in my darkened bedroom. He said he had my test results and without hesitation he unloaded it on me.

"Alonzo, your creatinine level is pretty high," he said. Before I could even remember whether that was a good or bad thing (I thought it was bad), he said, "You have a rare disease called focal glomerulosclerosis."

I was stunned.

I didn’t understand what he was saying except that something with as many syllables as "focal glomerulosclerosis" couldn’t be good. As a player I’d either experienced, or seen teammates experience, countless surgeries, medical treatments, injuries, and general ailments. Never had I heard of focal glomerulosclerosis.

"What did you say?" I asked. "What do I have?"

"You have a kidney disease called focal glomerulosclerosis," Dr. Richards said. I was completely awake now.

"Am I going to die?" I asked.

"You’re going to be okay."

"Well, will I be able to play basketball again?"

"That’s up to you."

"There’s a cure for this, isn’t there?"

"No."

He might as well have hit me with a baseball bat. No cure? What did that mean? I remember dropping my head into my hands; I was trying to grasp it all.

Had Dr. Richards really just said there was no cure for this disease I had never heard of? If there was no cure, how was it up to me to play basketball? What would I tell my wife? What would I tell my son? What would I tell my baby girl? Would I ever be able to play with them and watch them grow up? And how could—of all things—my body, my strength, my health, the one thing that never let me down, now be called into question?

At the same time, everything was moving so fast and so slow; my mind was racing while my stomach was churning.

"You’re going to need a kidney transplant," Dr. Richards continued.

This guy was incredible. He just kept coming with the bad news. A transplant?

"Ten to twelve months you’ll be on dialysis and you’ll be up for transplantation." At this point, I didn’t even know what Dr. Richards was going to say next; he was just lobbing SCUD missiles in on me, and I was just taking them. One minute ago I had been convinced I had the flu; I thought I just needed a long nap.

"Dialysis?" I said. "What is dialysis?" I was just freaking out. Dialysis seemed like something for old people. Victor was trying to explain but all I could think was Transplant? Did he say ‘transplant’?

Dr. Richards said, "Well, you know we’re probably going to have to interview some family members and you might need another kidney."

Another kidney? Obviously that is what a transplant entails, but it takes on a completely new meaning when you hear it said about your own body. Another kidney? Someone else’s kidney? In me?

I didn’t know what to say to Dr. Richards. I didn’t even try. He had just laid it out, painfully honest. I actually appreciated that; I’d rather know up front. He finally said he wanted me to come in and discuss the situation further. I thanked him, hung up, and put my head back in my hands. I had a whole bunch of stuff going through my head now. I didn’t cry, not one tear, although little did I know tears would come in buckets as this process played out.

Instead I just sat there thinking. This was so out of nowhere, so impossible to imagine. I thought the biggest challenge that coming year would be juggling the sleepless nights that come with a newborn while battling Shaquille O’Neal and Tim Duncan and pushing the Miami Heat to the NBA Championship.

Now points and rebounds were about to become secondary to hemofiltration and leukocyte antigens. Not that I knew those words yet.

Less than a minute after I hung up the phone, Tracy came to check in, and after one look at me sitting on the edge of the bed with my head down she knew something was terribly wrong. I had probably never sat that way in my entire life. I was the kind of person who attacked everything head on. All great athletes are—no secret there. When challenged, you fight. When that isn’t enough, you fight harder.

I grew up in a working class family in Chesapeake, Va. My parents were still teenagers when they had me. When I was ten, my parents’ marriage began to deteriorate, and eventually they divorced. In the interim, life at home became very difficult, very emotional.

It wasn’t the worst situation in the world, and my parents were both great people, but the atmosphere was not good for me. Emotionally, I began acting out. I wasn’t normally a bad kid; I was actually a good kid. But all of a sudden I was in trouble all the time, and it was obvious, even to me, why that was happening. My parents and I went to a counseling session at the department of social services and that’s when I asked to be put into a group home for a while.

Once I was in the group home, I saw kids with real problems, the kind that made mine seem like nothing. The place actually had a room with padded walls. There was a restraining chair and I witnessed hauntingly disturbing outbursts. But I still didn’t want to go home. Just because I wasn’t in the worst situation didn’t mean my parents’ place was a good one.

So I stood in front of a judge and asked him to put me into foster care, as crazy as that sounds. I think he figured if a 10 year old had the courage to do that, he deserved to have his request granted.

In the end, I got very lucky: I wound up with a woman named Fannie Threet, a local hero who as a foster mom helped raise forty-nine kids in Chesapeake. I was one of those children. Although I’ve reconciled with my parents and they remained supportive of me throughout, I never left foster care and never returned to live with either of them.

Even then, I realized that no matter how great the challenge there is a solution to every problem as long as you don’t fear the path to the solution.

That’s what made me who I am. By maximizing my athletic abilities, by assuring that I used basketball rather than having basketball use me, I earned a full scholarship to Georgetown University. And once I was there, that drive got me academically through one of the elite schools in the country.

I wasn’t your typical Georgetown student. Most of the kids came from upper- class families; I came from foster care. Most of my classmates had attended fancy college prep schools; I just went to regular public school in Chesapeake. Most of them had two parents who graduated from college, if not graduate school. I was the first person in my entire family to get a diploma. I just wasn’t as prepared as they were. But as long as I worked on my studies, I could succeed also. One semester, pushed by my coach, John Thompson, who claimed I was shamefully underachieving, I even made the Dean’s List en route to my degree.

It’s also the way I play basketball. I am a big man by general standards, but in the NBA, I often gave up four or five inches and sometimes fifty to seventy pounds to other players, guys like Shaquille O’Neal, my seven- foot- one, 350- pound chief rival and later teammate. Throughout my career I have prided myself on being an undersized center who can beat players bigger and stronger than me. I wasn’t the most naturally gifted player. So I had to outwork everyone else.

When you’ve prepared harder than everyone else, it instills confidence. Strength is not just physical, it is mental. And if you are mentally strong you can accomplish anything.

My faith is something that has also sustained me through the highs and lows, through the mistakes I’ve made and even through some of the triumphs. There have been a fair share of both, but there was only one time in my life—during my illness—when that faith came into question.

As a professional athlete, I’d trained myself to power through, to never question my will to succeed. Resilience was a trait that served me well. But in the darkest days of this battle against kidney disease, it was tested like never before. I was still a large man in stature, but at times I was as weak and helpless as my newborn baby. That wasn’t a situation I could easily accept, and it rocked my faith in a way that, to me, was almost unimaginable.

In the days, weeks, months, and years since then, that crushing moment became a sort of wake- up call. I now realize how grateful I am for it. I had to come to terms with my faith in ways that I never would have, had I not gotten kidney disease. I had to take the deepest possible look at my life, acknowledge each and every weakness, each and every mistake, and come to the realization that just because faith is in your head, doesn’t mean it is in your heart.

God puts you in situations to test your faith, and it can only grow stronger as you overcome these hurdles. From faith comes resilience.

Faith makes things possible. But as I would learn, it doesn’t make them easy.