João 17

João 17:3

Rightly therefore did Christ point out that one achieves supreme happiness not by knowing any one of them, but by knowing both, when he said: "Eternal life is this: to know you, the only true God, and Jesus Christ whom you have sent." As a consequence, those who follow the Lamb are said to have his name and the name of his Father written on their foreheads, which is to be glorified by this twofold knowledge. But one of you may interpose and say: "Therefore knowledge of the Holy Spirit is not necessary, because when he said eternal life consisted of the knowledge of the Father and Son, he did not mention the Holy Spirit." True enough; but where there is perfect knowledge of the Father and the Son, how can there be ignorance of the goodness of both; which is the Holy Spirit? For no man has a complete knowledge of another until he finds out whether his will be good or evil. So, although it has been said: "Eternal life is this: to know you, the only true God, and Jesus Christ whom you have sent," still, if that act of mission demonstrates the good pleasure both of the Father lovingly sending his Son and of the Son freely obeying the Father, then the Holy Spirit is not passed over in complete silence, for he is implied in the mention of so immense a grace. The Holy Spirit indeed is nothing else but the love and the benign goodness of them both. — Sermons on the Song of Songs, Sermon 8