With the mask of good remaining in fallen nature, the enemy strives to draw everyone away from Christ, cunningly showing that fallen good is the only good, which is the way it seems to someone who does not know the teachings of Christ. Regardless of all the seductions of the enemy, whoever would adhere to the Gospel teachings must unavoidably experience a struggle within himself. Fallen nature loves itself and loves this world, while the Gospel requires self-sacrifice and love of God. Therefore the two can never be reconciled.

Venerable Nikon of Optina
Living without Hypocrisy