"Having made a mistake or an inexact move, you should not think that "everything is lost", and be vexed, but quickly orientates yourself and in the new situation to look for a new plan."

David Bronstein, grandmaster

"Combination is a possible impossibility! It is a divine spark, which exist independently of all the other chess ideas, and illuminates the chess game as a meteor."

Savely Tartakover, grandmaster