Michael Schumacher — German Celebrity born on January 03, 1969,

Michael Schumacher is a retired German racing driver. He is a seven-time Formula One World Champion and is widely regarded as one of the greatest Formula One drivers of all time. He was named Laureus World Sportsman of the Year twice. He won two titles with Benetton in 1994 and 1995. After his second title he moved to Ferrari for which he drove eleven years. His time with Ferrari yielded five consecutive titles between 2000 and 2004... (wikipedia)

Those who have come into Formula One without experiencing cars devoid of electronic aids will find it tough. To control 800 horse power relying just on arm muscles and foot sensitivity can turn out to be a dangerous exercise.
When you start out in a team, you have to get the teamwork going and then you get something back.
I retired simply because I didn't have the passion and motivation anymore; I was tired. At the time I thought, 'Well, I had a great time, there is the end.' At some moment, there is the right time to call it an end.
Once something is a passion, the motivation is there.
You try to hide your emotions, so as not to show weaknesses to others. I believe it's the same for every sportsman.