When he, the Spirit of truth, is come, he will guide you into all truth. John 16:13. LHU 179.1
Before offering Himself as the sacrificial victim, Christ sought for the most essential and complete gift to bestow upon His followers, a gift that would bring within their reach the boundless resources of grace. “I will pray the Father,” He said, “and he shall give you another Comforter, that he may abide with you for ever; even the Spirit of truth; whom the world cannot receive, because it seeth him not, neither knoweth him: but ye know him; for he dwelleth with you, and shall be in you. I will not leave you orphans: I will come to you” (John 14:16-18, margin). LHU 179.2
Before this the Spirit had been in the world; from the very beginning of the work of redemption He had been moving upon men's hearts. But while Christ was on earth, the disciples had desired no other helper. Not until they were deprived of His presence would they feel their need of the Spirit, and then He would come. LHU 179.3
The Holy Spirit is Christ's representative, but divested of the personality of humanity, and independent thereof. Cumbered with humanity, Christ could not be in every place personally. Therefore it was for their interest that He should go to the Father, and send the Spirit to be His successor on earth. No one could then have any advantage because of his location or his personal contact with Christ. By the Spirit the Saviour would be accessible to all. In this sense He would be nearer to them if He had not ascended on high.... LHU 179.4
At all times and in all places, in all sorrows and in all afflictions, when the outlook seems dark and the future perplexing, and we feel helpless and alone, the Comforter will be sent in answer to the prayer of faith. Circumstances may separate us from every earthly friend; but no circumstance, no distance, can separate us from the heavenly Comforter. Wherever we are, wherever we may go, He is always at our right hand to support, sustain, uphold, and cheer.... LHU 179.5
The Comforter is called “the Spirit of truth.” His work is to define and maintain the truth. He first dwells in the heart as the Spirit of truth, and thus He becomes the Comforter. There is comfort and peace in the truth, but no real peace or comfort can be found in falsehood. It is through false theories and traditions that Satan gains his power over the mind. By directing men to false standards, he misshapes the character. Through the Scriptures the Holy Spirit speaks to the mind, and impresses truth upon the heart. Thus He exposes error, and expels it from the soul. It is by the Spirit of truth, working through the Word of God, that Christ subdues His chosen people to Himself (The Desire of Ages, 668-671). LHU 179.6