“Le conflit est la mouche du coche de la pensée. Il stimule l'observation et la mémoire.”Morale et conduite
En anglais : "Conflict is the gadfly of thought. It stirs us to observation and memory. It instigates invention. It shocks us out of sheep-like passivity, and sets us at noting and contriving…conflict is a sine qua non of reflection and ingenuity."