"Do not pray for an easy life, instead pray for the strength to endure a difficult one."
"Adapt what is useful, reject what is useless, and add what is specifically your own."
"Don't think, feel. It is like a finger pointing at the moon. Don't concentrate or you'll miss all that heavenly glory!"
"Mistakes are forgivable if one has the courage to admit them."
"To hell with circumstances; I create opportunities."
"I fear not the man who practiced 1000 kicks once. I fear the man who practiced one kick 1000 times."
"Empty your mind. Be formless. Shapeless, like water. You put water in a cup, it becomes the cup. You put water in a bottle, it becomes the bottle. You put water in a teapot, it becomes the teapot. Water can flow or it can crash. Be water my friend."
All of those are by Bruce Lee, one of the greatest Martial Artists who ever lived.