Pseudo-Chrysostom
Catena Aurea · Matthäusevangelium 7
Or what man is there of you, whom if his son ask bread, will he give him a stone? Or if he ask a fish, will he give him a serpent? If ye then, being evil, know how to give good gifts unto your children, how much more shall your Father which is in heaven give good things to them that ask him?
Lest perchance any one considering how great is the difference between God and man, and weighing his own sins should despair of obtaining, and so never take in hand to ask; therefore He proposes a comparison of the relation between father and son; that should we despair because of our sins, we may hope because of God’s fatherly goodness.