/summa/TP/TPII/TP_Q39:
We have now to consider the baptizing of Christ, concerning which there are eight points of inquiry:
(1) Whether Christ should have been baptized?
(2) Whether He should have been baptized with the baptism of John?
(3) Of the time when He was baptized;
(4) Of the place;
(5) Of the heavens being opened unto Him;
(6) Of the apparition of the Holy Ghost under the form of a dove;
(7) Whether that dove was a real animal?
(8) Of the voice of the Father witnessing unto Him.