"Each lose is a valuable lesson to the loser. He who does not lose, does not move forward. That is an iron law, true to every living thing. He who succeeds in everything, loses his creative abilities."
Emanuel Lasker, Champion of the World
"Chess is a game in form, an art in content, and, in the difficulty of mastering it, it is a science."
Tigran Petrosian , Champion of the World