It is said that an ounce of common sense can outweigh a ton of 'variations'.
I never defeated a healthy opponent.
No one ever won a game by resigning.
Lasker thought that his rationalism rendered him immune from the surprises of chess theory.
The winner is the one who makes the next-to-last mistake.
As for me, I am unfortunate enough not to posses a happy temperament like Najdorf, who views every happening in a rosy light and avoids any possibility of self-criticism. I am one of those unlucky skeptics who never overlook the dark side of even the happiest experience.