"You can't be happy about doping at all, it's not good for the sport. But over the years we're doing a better job, it's getting clean and we're catching up to a lot of athletes. There's an understandin…"

"I'm not going to say I'm the fastest man in the world, but I'm close."

"I'm not going to say I'm the fastest man in the world. I'm just going to say I'm the fastest man on the track."

"I'm just trying to inspire kids to believe in themselves."

"I'm just trying to make the most of every opportunity."