Whether it was becoming, when Christ was baptized that the Father's voice should be heard, bearing witness to the Son?

Objections

Objection 1 : It would seem that it was unbecoming when Christ was baptized for the Father's voice to be heard bearing witness to the Son. For the Son and the Holy Ghost, according as they have appeared visibly, are said to have been visibly sent. But it does not become the Father to be sent, as Augustine makes it clear (De Trin. ii). Neither, therefore, (does it become Him) to appear.
Objection 2 : Further, the voice gives expression to the word conceived in the heart. But the Father is not the Word. Therefore He is unfittingly manifested by a voice.
Objection 3 : Further, the Man-Christ did not begin to be Son of God at His baptism, as some heretics have stated: but He was the Son of God from the beginning of His conception. Therefore the Father's voice should have proclaimed Christ's Godhead at His nativity rather than at His baptism.