St. Isaac the Syrian: . . . But do not sin, O man, expecting that you will repent . . .
“Our frail nature would not be strong enough if God’s justice were to rise up to take vengeance. Therefore, He employs mercy, since at all times we are held by debt. But do not sin, O man, expecting that you will repent; and do not succumb [to sin] being confident of forgiveness! Remember that death will not delay. Do not craftily seek means to draw nigh the pleasure of sin with a knavish mind! God is not mocked [Gal. 6:7]. His knowledge precedes your thoughts. Affliction will overtake you suddenly, and when you cry out, He will not answer you.”
+ St. Isaac the Syrian, The Ascetical Homilies, Homily 64