2 Corinthians 7:10

There is repentance of sin: though it be a deep sorrow for sin that God requires as necessary to salvation, yet the very nature of it necessarily implies delight. Repentance of sin is a sorrow arising from the sight of God’s excellency and mercy, but the apprehension of excellency or mercy must necessarily and unavoidably beget pleasure in the mind of the beholder. (Jonathan Edwards)

This is so true! The sorrow that we feel when we turn from sin is the beginning of joy because that when we see the glory of Christ, the object of joy.