It is expedient for you that I go away: for if I go not away, the Comforter will not come unto you; but if I depart, I will send him unto you. And when he is come, he will reprove the world of sin, and of righteousness, and of judgment. John 16:7, 8. LHU 191.1
Christ, the Great Teacher, had an infinite variety of subjects from which to choose, but the one upon which He dwelt most largely was the endowment of the Holy Spirit (Selected Messages 1:156). LHU 191.2
In describing to His disciples the office work of the Holy Spirit, Jesus sought to inspire them with the joy and hope that inspired His own heart. He rejoiced because of the abundant help He had provided for His church. The Holy Spirit was the highest of all gifts that He could solicit from His Father for the exaltation of His people. The Spirit was to be given as a regenerating agent, and without this the sacrifice of Christ would have been of no avail. The power of evil had been strengthening for centuries, and the submission of men to this satanic captivity was amazing. Sin could be resisted and overcome only through the mighty agency of the Third Person of the Godhead, who would come with no modified energy, but in the fullness of divine power. It is the Spirit that makes effectual what has been wrought out by the world's Redeemer. It is by the Spirit that the heart is made pure. Through the Spirit the believer becomes a partaker of the divine nature. Christ has given His Spirit as a divine power to overcome all hereditary and cultivated tendencies to evil, and to impress His own character upon His church. LHU 191.3
Of the Spirit Jesus said, “He shall glorify Me.” The Saviour came to glorify the Father by the demonstration of His love; so the Spirit was to glorify Christ by revealing His grace to the world. The very image of God is to be reproduced in humanity. The honor of God, the honor of Christ, is involved in the perfection of the character of His people. LHU 191.4
“When He [the Spirit of truth] is come, He will reprove the world of sin, and of righteousness, and of judgment.” The preaching of the Word will be of no avail without the continual presence and aid of the Holy Spirit. This is the only effectual teacher of divine truth. Only when the truth is accompanied to the heart by the Spirit will it quicken the conscience or transform the life. One might be able to present the letter of the Word of God, he might be familiar with all its commands and promises; but unless the Holy Spirit sets home the truth, no souls will fall on the Rock and be broken. No amount of education, no advantages, however great, can make one a channel of light without the cooperation of the Spirit of God.... This promised blessing, claimed by faith, brings all other blessings in its train. It is given according to the riches of the grace of Christ, and He is ready to supply every soul according to the capacity to receive (The Desire of Ages, 671, 672). LHU 191.5