Do not sin…

But do not sin… 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.
–Saint Isaac of Syria (Seventh Century)