The passed Pawn is a criminal, who should be kept under lock and key. Mild measures, such as police surveillance, are not sufficient
Aron NimzowitschThe knight of QB3 is under obligation, the moment the enemy gives him the chance, of undertaking an invasion of the center by Kn-Q5.
Aron NimzowitschDo not always be thinking of attack! Moves that safeguard your position are often far more prudent.
Aron Nimzowitsch