6 “Who crowns you with mercy and loving-kindness.” You had perhaps begun to be in a manner proud, when you heard the words, “He crowns you.” I am then great, I have then wrestled. By whose strength? By yours, but supplied by Him....He crowns you, because He is crowning His own gifts, not your deservings. “I laboured more abundantly than they all,” said the Apostle; but see what he adds: “yet not I, but the grace of God which was with me.”...It is then by His mercy that you are crowned; in nothing be proud; ever praise the Lord; forget not all His rewards. It is a reward when thou, a sinner and an ungodly man, hast been called, that you may be justified. It is a reward, when you are raised up and guided, that you may not fall. It is a reward, when strength is given you, that you may persevere unto the end. It is a reward, that even that flesh of yours by which you were oppressed rises again and that not even a hair of your head perishes. It is a reward, that after your resurrection you are crowned. It is a reward, that you may praise God Himself for evermore without ceasing....
Source: The Enarrations, or Expositions, on the Psalms (New Advent)