Andreas of Caesarea : The divine law wants us to be perfect, but on the way toward perfection it has us first drink milk, as if we were newborn babies, and by that milk we shall grow toward salvation. Paul spoke to the same effect when he said: "Do not be children in understanding, but be innocent in wrongdoing. In understanding be adults." For it is not possible to advance toward purity, or toward maturity in understanding, or toward adulthood as a worker approved by God, unless you renounce evil and become like an innocent child. — CATENA Apostolic Constitutions : For you are translated from your former vain and tedious mode of life and have contemned the lifeless idols, and despised the demons, which are in darkness, and have run to the "true light," [John 1:9] and by it have "known the one and only true God and Father," [John 17:3] and so are owned to be heirs of His kingdom. For since you have "been baptized into the Lord's death," [Romans 6:3] and into His resurrection, as "new-born babes," [1 Peter 2:2] you ought to be wholly free from all sinful actions; "for you are not your own, but His that bought you" [1 Corinthians 6:19-20] with His own blood. — Apostolic Constitutions (Book V), Section 3, XVI Bede : In accordance with the apostolic principle of discretion, to disciples who are still ignorant the priests supply elementary doctrine, which is the rational milk without guile. But they also provide the solid food of more sublime doctrine to those who are more nearly perfect. — On the Tabernacle 2.10.81 Bede : Desire the rational and pure milk, without guile, etc. This precept of desiring the milk of the word pertains to those who come to hear the sacred readings unwillingly and disdainfully, ignorant of that thirst and hunger of which the Lord said: Blessed are they who hunger and thirst for righteousness (Matt. V). Therefore, they arrive more slowly at the full growth of salvation, by which they could be refreshed with the solid food of the word, that is, to know the divine mysteries or to do greater good. — Commentary on the Catholic Epistles Hilary of Arles : Milk has three forms which can be compared to doctrine, that is, the liquid, cheese and butter. Liquid milk is the literal sense of Scripture, cheese is the moral sense, and butter is the spiritual sense. Find a good teacher and you will soon learn these things. — INTRODUCTORY COMMENTARY ON 1 PETER