Augustine of Hippo — as excerpted in the Catena Aurea on John 6:1-14

“(Tr. xxiv. s. 6) And what are the fragments, but the parts which the people could not eat? An intimation, that those deeper truths, which the multitude cannot take in, should be entrusted to those who are capable of receiving them, and afterwards teaching them to others; as were the Apostles. For which reason twelve baskets were filled with them.”