Reply to Objection 3: These words of Peter are referred by some to Christ's descent into hell: and they explain it in this sense: "Christ preached to them who formerly were unbelievers, and who were shut up in prison"---that is, in hell---"in spirit"---that is, by His soul. Hence Damascene says (De Fide Orth. iii): "As He evangelized them who are upon the earth, so did He those who were in hell"; not in order to convert unbelievers unto belief, but to put them to shame for their unbelief, since preaching cannot be understood otherwise than as the open manifesting of His Godhead. which was laid bare before them in the lower regions by His descending in power into hell.
Augustine, however, furnishes a better exposition of the text in his Epistle to Evodius quoted above, namely, that the preaching is not to be referred to Christ's descent into hell, but to the operation of His Godhead, to which He gave effect from the beginning of the world. Consequently, the sense is, that "to those (spirits) that were in prison"---that is, living in the mortal body, which is, as it were, the soul's prison-house---"by the spirit" of His Godhead "He came and preached" by internal inspirations, and from without by the admonitions spoken by the righteous: to those, I say, He preached "which had been some time incredulous," i.e. not believing in the preaching of Noe, "when they waited for the patience of God," whereby the chastisement of the Deluge was put off: accordingly (Peter) adds: "In the days of Noe, when the Ark was being built."
