I begin with the principle that all men are bores. Surely no one will prove himself so great a bore as to contradict me in this. Soren Kierkegaard
He was not so anxious to prove himself right, as to be so. Anthony Trollope
A guy that's undersized has to prove himself right away. Doug Flutie
I'm tough when I have to be, tender when I should be. When you find a really tough guy, he's not a predator. He doesn't have to prove himself. Guys who have to pretend to be tough, they ain't. I'm tough. Mr. T
A man should live to prove himself worth of his own flesh and blood. African Proverb