It is better to follow out a plan consistently even if it isn't the best one than to play without a plan at all. The worst thing is to wander about aimlessly.
Alexander KotovGo through detailed variations in your own time, think in a general way about the position in the opponent's time and you will soon find that you get into time trouble less often, that your games have more content to them, and that their general standard rises.
Alexander KotovOnce in a Moscow chess club I saw how two first-category players knocked pieces off the board as they were exchanged, so that the pieces fell onto the floor. It was as if they were playing skittles and not chess!
Alexander KotovThere is no doubt that the reason for my awful oversight was over-confidence that sapped my sense of danger. So that is where to look for the cause of bad blunders - in the exulting feeling of self-congratulation.
Alexander Kotov