The Catholic Thing Infusion of faith

Through baptism a person is reborn to a spiritual life, one proper to Christ’s faithful, as the Apostle says (Gal 2:20), “the life I now live in the flesh I live by faith in the Son of God.” But this life belongs only to the members who are united with the head, from whom they receive sense and movement. And therefore it is necessary that through baptism a person is incorporated into Christ as his member. For just as sense and movement flow from the natural head to its [bodily] members, so from the spiritual head, who is Christ, flow to his members both a spiritual sense, which consists in the knowledge of the truth, and a spiritual movement, which operates through the inspiration of grace. Hence John says (1:14, 16), “We have seen him full of grace and truth, and of his fullness we have all received.” And therefore it follows that the baptized are enlightened by Christ regarding the knowledge of the truth, and they are impregnated by him with an abundance of good works through the infusion of faith.