The three major features of opening play are development, central control and king safety. If you can obtain an advantage in one of these three areas it can prove decisive in winning the game. Mike Basman, Chess Openings
If the club player can understand the basic strategy in a particular variation, and this should be well within his powers, he can also hope to discover new and strong moves for himself. Leonard Barden & Tim Harding, The Batsford Guide To Chess Openings
If your pieces get tied down to defending pawns, your enemy can switch his attack to a different part of the board and you will not be able to react in time. Shaun Taulbut, Positional Chess
In a queen-and-pawn endgame, the superior side needs a passed pawn. If the inferior side has one, he can often force a draw even if he is a couple of pawns down. David LeMoir, How To Be Lucky In Chess
The most valuable builder of judgment is the playing over of published games, always, of course, covering one side's moves with a card and thinking over what you would play before looking. Cecil Purdy, CJS Purdy's Fine Art Of Chess Annotation And Other Thoughts - Volume Two