William Burkitt on Matthew 5:45

To encourage us to the foregoing duty of loving our enemies, our Saviour propounds the example of God himself to our imitation. That you may be the children of your Father; that is, that you may be known to be the children of your Father which is in heaven, by your likeness to him, and imitation of him.

Note, 1. That the best evidence we can have of our divine sonship, is our conformity to the divine nature, especially in those excellent properties of goodness and forgiveness.

Note, 2. That God doth good to them that are continually doing evil unto him. Rain and sun, fat and sweet, gold and silver, are such good things as their hearts and houses are filled with, who are altogether empty of grace and goodness.