Descent of the Holy Spirit upon Mary and the Apostles on Pentecost - by TIZIANO Vecellio - from Santa Maria della Salute, Venice
The Role of Sanctification of all Angels and Men is attributed to the Holy Spirit, by means of His Holy Grace
Grace is from God (Person of the Holy Spirit), and works in the depth of the Soul whose Powers it employs. It is a Light which issues forth to do service under the Guidance of the Holy Spirit. The Divine Light permeates the Soul, and lifts it above the Turmoil of Temporal Things to rest in God.
Meister Johannes Eckhart, Dominican Mystic
Before the Council of Trent, the Schoolmen seldom used the term Gratia Actualis, preferring Auxilium Speciale, Motio Divina, and similar designations; nor did they formally distinguish Actual Grace from Sanctifying Grace. But, in consequence of modern controversies regarding Grace, it has become usual and necessary in Theology to draw a sharper distinction between the Transient Help-to-Act (Actual Grace) and the Permanent State-of-Grace (Sanctifying Grace). For this reason we adopt this distinction as our Principle of Division in our exposition of the Catholic Doctrine.
Since the End and Aim of all Efficacious Grace is directed to the Production of Sanctifying Grace where it does not already exist, or to Retain and Increase it where it is already present, its Excellence, Dignity, and Importance become immediately apparent; for Holiness and the Sonship of God depend solely upon the Possession of Sanctifying Grace, wherefore it is frequently called simply Grace without any qualifying word to accompany it as, for instance, in the phrases "to live in Grace" or "to fall from Grace".