Catena Aurea on Matthew 5:43–48: Augustine of Hippo

Or we may take it of this visible sun, and of the rain by which the fruits are nourished, as the wicked mourn in the book of Wisdom, “The Sun has not risen for us.” [Wis 5:6] And of the rain it is said, “I will command the clouds that they rain not on it.” [Isa 5:6] But whether it be this or that, it is of the great goodness of God, which is set forth for our imitation. He says not, ‘the sun,’ but, “His sun,” that is, the sun which Himself has made, that hence we may be admonished with how great liberality we ought to supply those things that we have not created, but have received as a boon from Him.