"I may not have gone where I intended to go, but I think I have ended up where I intended to be." - Douglas Adams
"Do not follow where the path may lead. Go instead where there is no path and leave a trail. T.S. Eliot
"No bird soars too high if he soars with his own wings." - William Blake
"Shoot for the moon. Even if you miss, you'll land among the stars." - Les Brown
"To be daunted by no difficulty; to keep heart when all have lost it -- who can say this is not greatness?" - William Makepeace Thackeray
Some ideas