Always put the rook behind the pawn.... Except when it is incorrect to do so.
Every move creates a weakness.
When you see a good move, sit on your hands and see if you can find a better one.
White has no positional equivalent for the centralized pawn.
I have always a slight feeling of pity for the man who has no knowledge of chess, just as I would pity the man who has remained ignorant of love.
As Rousseau could not compose without his cat beside him, so I cannot play chess without my king's bishop. In its absense the game to me is lifeless and void. The vitalizing factor is missing, and I can devise no plan of attack.