But God, who is rich in mercy - On the use of the word “rich” by Paul, see the notes at Ephesians 1:7. It is a beautiful expression. “God is ‘rich’ in mercy;” overflowing, abundant. Mercy is the riches or the wealth of God. People are often rich in gold, and silver, and diamonds, and they pride themselves in these possessions; but God is “rich in mercy.” In that he abounds and he is so rich in it that he is wilting to impart it to others; so rich that he can make all blessed.
For his great love - That is, his great love was the reason why he had compassion upon us. It is not that we had any claim or deserved his favor; but it is, that God had for man original and eternal love, and that love led to the gift of a Saviour, and to the bestowment of salvation.