Matthew 5:45 - Ellicott's Commentary On The Whole Bible

That ye may be. — Literally, and with far fuller meaning, that ye may become. We cannot become like God in power or wisdom. The attempt at that likeness to the Godhead was the cause of man’s fall, and leads evermore to a like issue; but we cannot err in striving to be like Him in His love. (Comp. St. Paul’s “followers [or, more literally, imitators”] of God” in Ephesians 5:1.) And the love which we are to reproduce is not primarily that of which the children of the kingdom are the direct objects, showing itself in pardon, and adoption, and spiritual blessings, but the beneficence which is seen in Nature. Our Lord assumes that sunshine, and rain, and fruitful seasons are His Father’s gifts, and proofs (whatever may be urged to the contrary) of His loving purpose. Here, again, the teaching of the higher Stoics presents an almost verbal parallel: “If thou wouldst imitate the gods, do good even to the unthankful, for the sun rises even on the wicked, and the seas are open to pirates” (Seneca, De Benefic. iv. 2, 6).