"If God delays the punishment of sinners, waiting for them to repent, it is not because his character has changed, so that now he loves sin. Rather he is giving them time to repent." (Cyril of Alexandria, 375-444)*
This quote is included in a wonderful book that I'm using both for my devotions and my weekly sermon prep.
*"The Lord is not slow about his promise, as some think of slowness, but is patient with you, not wanting any to perish, but all to come to repentance" (2 Peter 3:9)