Even a mistake may turn out to be the one thing necessary to a worthwhile achievement.
There is joy in work. There is no happiness except in the realization that we have accomplished something.
When everything seems to be going against you, remember that the airplane takes off against the wind, not with it.
Exercise is bunk. If you are healthy, you don't need it, if you are sick you should not take it.
One of the great discoveries a man makes, one of his great surprises, is to find that he can do what he was afraid he couldn’t do.