Father Isaac Hecker

By the sacrament of Baptism, the Holy spirit communicates Himself to the essence of the soul and substantially dwells within it as in His temple. To this indwelling divine presence is attached certain virtues, gifts and privileges which are infused therewith into the soul. It is by the exercise of these dispositions called habits or virtues and the cooperation with the movements of the Holy Spirit in the soul that the soul is sanctified. Sanctification is nothing else than the soul acting habitually by the instinct of the divine ideal, the Holy Spirit.