Origen
Catena Aurea · Lukasevangelium 11
And I say unto you, Ask, and it shall be given you; seek, and ye shall find; knock, and it shall be opened unto you. For every one that asketh receiveth; and he that seeketh findeth; and to him that knocketh it shall be opened. If a son shall ask bread of any of you that is a father, will he give him a stone? or if he ask a fish, will he for a fish give him a serpent? Or if he shall ask an egg, will he offer him a scorpion? If ye then, being evil, know how to give good gifts unto your children: how much more shall your heavenly Father give the Holy Spirit to them that ask him?
Consider then this, if the bread be not indeed the food of the soul in knowledge, without which it can not be saved, as, for example, the well planned rule of a just life. But the fish is the love of instruction, as to know the constitution of the world, and the effects of the elements, and whatever else besides wisdom treats of. Therefore God does not in the place of bread offer a stone, which the devil wished Christ to eat, nor in the place of a fish does He give a serpent, which the Ethiopians eat who are unworthy to eatfishes. Nor generally in the place of what is nourishing does he give what is not eatable and injurious, which relates to the scorpion and egg.