Augustine of Hippo
Catena Aurea · Matthäusevangelium 5
Ye have heard that it hath been said, Thou shalt love thy neighbour, and hate thine enemy. But I say unto you, Love your enemies, bless them that curse you, do good to them that hate you, and pray for them which despitefully use you and persecute you; That ye may be the children of your Father which is in heaven: for He maketh His sun to rise on the evil and on the good, and sendeth rain on the just and on the unjust. For if ye love them which love you, what reward have ye? do not even the Publicans the same? And if ye salute your brethren only, what do ye more than others? do not even the Publicans so? Be ye therefore perfect, even as your Father which is in heaven is perfect.
(De Civ. Dei, i. 8.) For the good man is not puffed up by worldly goods, nor broken by worldly calamity. But the bad man is punished in temporal losses, because he is corrupted by temporal gains. Or for another reason He would have good and evil common to both sorts of men, that good things might not be sought with vehement desire, when they were enjoyed even by the wicked; nor the evil things shamefully avoided, when even the righteous are afflicted by them.