He who has been trained by the prophet’s words not only refrains from the outward fulfillment of the passions but also renounces all assent to them in his soul. He is not content simply to appear to abstain from sin in the inferior part of himself, the flesh, while secretly allowing its free rein in his superior part, the soul.
He who has truly embraced the life of the Gospel has made himself immune to both the promptings and performance of evil, and pursues every virtue in action and thought. He offers a sacrifice of praise and thanksgiving (Psalm 116:17), for he has been set free from all disturbance produced by the passions and liberated from mental warfare against them; and he feeds his soul with the hope of the blessings held in store, his one unquenchable delight….
~St Maximos the Confessor