Augustine of Hippo

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(de Cons. Ev. ii. 14.) These words Mark and Luke give in the same way; in the words of the voice that came from Heaven, their expression varies though the sense is the same. For both the words as Matthew gives them, This is my beloved Son, and as the other two, Thou art my beloved Son, express the same sense in the speaker; (and the heavenly voice, no doubt, uttered one of these,) but one shews anintention of addressing the testimony thus borne to the Son to those who stood by; the other of addressing it to Himself, as if speaking to Christ He had said, This is my Son. Not that Christ was taught what He knew before, but they who stood by heard it, for whose sake the voice came. Again, when one says, in whom I am well-pleased; another, in thee it hath pleased me, if you ask which of these was actually pronounced by that voice; take which you will, only remembering that those who have not related the same words as were spoken have related the same sense. That God is well-pleased with His Son is signified in the first; that the Father is by the Son pleased with men is conveyed in the second form, in thee it hath well-pleased me. Or you may understand this to have been the one meaning of all the Evangelists, In Thee have I put My good pleasure, i. e. to fulfil all My purpose.