If we look at the work of the Spirit on the heart, we shall see how, in all his sacred dealings and gracious movements, he invariably employs truth as his grand instrument. Does he pierce and wound? It is by the truth; for the "sword of the Spirit is the word of God," and that we know is "the word of truth." If he mercifully heal, if he kindly bless, it is still by means of truth; for the promise is, "Howbeit, when he, the Spirit of truth is come, he will guide you into all truth." And when he thus comes, it is as a Comforter, according to those gracious words, "But when the Comforter is come, whom I will send unto you from the Father, even the Spirit of truth, which proceedeth from the Father, he shall testify of me."
In fact, if we look at the new man of grace that the blessed Spirit begets and brings forth in the heart, we shall see that all his members and faculties are formed and adapted to a living reception of the truth. As the eye is adapted to light; as the ear to sound; as the lungs to the pure air that fills them with every breath; as the heart to the vital blood which it propels through every bounding artery, so is the new man of grace fitted and adapted to the truth of God. And as these vital organs perform their peculiar functions only as they receive the impressions which these external agents produce upon them, so the organs of the new man of grace only act as truth is impressed upon them by the power of the blessed Spirit. Has, then, the new man of grace eyes? It is to see the truth (Eph. 1:18, 19). Has he ears? It is to hear the truth (Isa. 55:3; Luke 9:44). Has he hands? It is to lay hold of and embrace the truth (Prov. 4:13; Isa. 27:5; Heb. 6:18). Has he feet? It is that he may walk in the truth (Psa. 119:45; Luke 1:6; 3 John 4). Has he a mouth? "Open thy mouth wide, and I will fill it." It is that he may feed upon the truth, the living truth, yea, upon His flesh who is truth itself (John 6:35, 14:6).