Putting away therefore all wickedness, all deceit, hypocrisies, envies, and all evil speaking,
Infancy is here set by Peter in opposition to the ancientness of the flesh, which leads to corruption; and under the word milk, he includes all the feelings of spiritual life. For there is also in part a contrast between the vices which he enumerates and the sincere milk of the word; as though he had said, “Malice and hypocrisy belong to those who are habituated to the corruptions of the world; they have imbibed these vices: what pertains to infancy is sincere simplicity, free from all guile. Men, when grown up, become imbued with envy, they learn to slander one another, they are taught the arts of mischief; in short, they become hardened in every kind of evil: infants, owing to their age, do not yet know what it is to envy, to do mischief, or the like things.” He then compares the vices, in which the oldness of the flesh indulges, to strong food; and milk is called that way of living suitable to innocent nature and simple infancy. 