149. (4) The Lord makes these energies operative in those who believe in Him. That these energies, which are meant by the sending of the Holy Spirit, are made operative by the Lord in those who believe in Him, that is, that such are reformed, regenerated, renewed, vivified, sanctified, justified, purified from evils, and at length are saved by the Lord, is evident from all those passages in the Word quoted above (n. 107) which prove that those who believe in the Lord have salvation and eternal life; also especially from this:
Jesus said, He that believeth on Me, as the Scripture hath said, out of his belly shall flow rivers of living water. But this spoke He of the Spirit which they that believed in Him were to receive (John 7:38, 39).
And from this:
The testimony of Jesus is the spirit of prophecy (Apoc. 19:10). "The spirit of prophecy" means truth of doctrine from the Word, "prophecy" signifying doctrine, while "to prophesy" signifies to teach doctrine; and "the testimony of Jesus" means confession from faith in Him. "His testimony" has a similar meaning in the following passage:
The angels of Michael overcame the dragon through the blood of the Lamb and through the word of their testimony. And the dragon went away to make war with the rest of her seed who kept the commandments of God and have the testimony of Jesus Christ (Apoc. 12:11 17).