For as the heaven is high above the earth, so great is his mercy toward them that fear him.
Read Chapter 103
Augustine of Hippo
15. "He hath not dealt with us according to our sins" (ver. 10). Thanks unto God, because He hath vouchsafed this. We have not received what we were deserving of: "He hath not dealt with us according to our sins, nor rewarded us according to our wickednesses." "For as the height of heaven above the earth, so hath the Lord confirmed His mercy toward them that fear Him" (ver. 11). Observe the heaven: everywhere on every side it covereth the earth, nor is there any part of the earth not covered by the heaven. Men sin beneath heaven: they do all evil deeds beneath the heaven; yet they are covered by the heaven. Thence is light for the eyes, thence air, thence breath, thence rain upon the earth for the sake of its fruits, thence all mercy from heaven. Take away the aid of heaven from the earth: it will fail at once. As then the protection of heaven abideth upon the earth, so doth the Lord's protection abide upon them that fear Him. Thou fearest God, His protection is above thee. But perhaps...
Earth. There is no proportion between God's mercy and our crimes. (Calmet)
Sins are perfectly washed away, (Worthington) and not barely covered, as the east cannot be the west. (Berthier)
Sin remitted "sets for ever. "(St. Augustine)