“He who is ignorant of the enemy’s ambush is easily slain; and he who does not know the causes of the passions is soon brought low.”
St. Mark the Ascetic, “On the Spiritual Law: Two Hundred Texts” No. 76, The Philokalia: The Complete Text (Vol. 1)
St. Mark the Ascetic: He who is ignorant of the enemy’s ambush . . .