Augustine of Hippo
Catena Aurea · Lukasevangelium 11
And he said unto them, Which of you shall have a friend, and shall go unto him at midnight, and say unto him, Friend, lend me three loaves; For a friend of mine in his journey is come to me, and I have nothing to set before him? And he from within shall answer and say, Trouble me not: the door is now shut, and my children are with me in bed; I cannot rise and give thee. I say unto you, Though he will not rise and give him, because he is his friend, yet because of his importunity he will rise and give him as many as he needeth.
(ubi sup.) But when thou shalt have obtained the three loaves, that is, the food and knowledge of the Trinity, thou hast both the source of life and of food. Fear not. Cease not. For that bread will not come to an end, but will put an end to your want. Learn and teach. Live and eat.