In fact, I'd say it takes much more effort to consciously do than it does to just stay sad, but with all my heart, I cannot tell you how worth it it is.

CNN: Robin Williams' daughter speaks out about depression

"My heart was in my mouth, but I never gave up and just kept pushing and pushing, " he said.

BBC: Hamilton targets title hat-trick

From that point it was a difficult decision, but it wasn't a difficult decision for me because I just knew in my heart that the time was right and I was very happy and comfortable in what I had achieved and what I had done.

CNN: SHARE THIS