Too many times, people don't try their best. They don't have the keen spirit; the winning spirit. And once you make it you've got to guard your reputation - every day go in like an unknown to prove yourself. That's why I don't clown around. I don't believe in wasting time. My goal is to win the World Chess Championship; to beat the Russians. I take this very seriously.

Fischer v Spassky: the World Chess Championship Match, 1972 (ed. 1972)