For the Son, as the Mediator between God and men, and as Head of the Church, calls these people to himself through the Holy Spirit and the Word of truth (Matt 11:28). The Holy Spirit equips the preachers of the Word with gifts that are needed to draw those people — to whom the Father sends them in the name of the Son — into communion with Christ by His summons (1 Cor 12:4; Heb 2:4).

Synopsis of a Purer Theology, Vol. 1, 343.