Michael Stean quotes:

The most important feature of the Chess position is the activity of the pieces. This is absolutely fundamental in all phases of the game: Opening, Middlegame and especially Endgame. The primary constraint on a piece's activity is the Pawn structure

The psychological effects of having to hold a prospectless position for what might seem an infinite amount of time does nothing to aid the defender's concentration.

The winner of the first point is the loser of the last.

Never in the history of chess have so many moves been repeated so often so quickly by so many people who didn't really understand them.