Musar zu Jirmejahu 3:12

This is the general rule: there is no hour in the life of man that if he does complete repentance, it will not be accepted and his prayer answered. The Creator is not like the created who can abandon forever or bear a grudge forever, as it is said (Isaiah 57:16), “For I will not contend forever, neither will I be always wroth.” And as it is said (Jeremiah 3:12), “For I am merciful, saith the Lord, I will not bear a grudge for ever.” And on this theme, it is said (Isaiah 55:6), “Seek ye the Lord while He may be found,” meaning at those times when He can be found or in other words, as long as a man lives.