God hath fulfilled the same unto us their children, in that he hath raised up Jesus again; as it is also written in the second psalm, Thou art my Son, this day have I begotten thee.
Ver. 33. In the second Psalm] Erasmus testifieth, that some ancient copies here have it, "in the first Psalm;" either because the first and second were of old but one Psalm, or because the first is not properly a Psalm, but a preface to the Psalms; like as the 119th Psalm is set (saith one) as a poem of commendation before the book of God, mentioning it in every verse, testimonies, laws, statutes, word, &c.
This day have I begotten thee] That is, I have this day of thy manifestation in the flesh made known that thou art my Son, as well by my testimony of thee as by thine assumption of humun nature.