Jesus himself, when he began to teach, was about thirty years old, being the son (as was supposed) of Joseph, the son of Heli,
He saw the Spirit of God That is, John saw: for it immediately follows, that the Spirit descended on Christ There now arises a third question, how could John see the Holy Spirit? I reply: As the Spirit of God is everywhere present, and fills heaven and earth, he is not said, in a literal sense, to descend, and the same observation may be made as to his appearance. Though he is in himself invisible, yet he is spoken of as beheld, when he exhibits any visible sign of his presence. John did not see the essence of the Spirit, which cannot be discerned by the senses of men; (298) nor did he see his power, which is not beheld by human senses, but only by the understanding of faith: but he saw the appearance of a dove, under which God showed the presence of his Spirit. It is a figure of speech, (299) by which the sign is put for the thing signified, the name of a spiritual object being applied to the visible sign. 