That you may be the children of your Father who is in heaven: for he makes his sun to rise on the evil and on the good, and sends rain on the just and on the unjust.
All Commentaries on Matthew 5:45 Go To Matthew 5
Augustine of Hippo
AD 430
With regard to what immediately follows, namely, “That you may be children of your Father who is in heaven,” it is to be understood in the sense in which John also speaks when he says, “He gave them the power of becoming children of God.” For there is One who is the Son by nature, and he absolutely knows no sin. But since we have received the power to become sons, we are made sons insofar as we fulfill the precepts that have been given by the Son. “Adoption” is the term used by the apostle to denote the character of our vocation to the eternal inheritance, in order to be joint heirs with Christ. By spiritual regeneration we therefore become sons and are adopted into the kingdom of God, not as aliens but as his creatures and offspring. .