"If we live in the Spirit, let us also walk in the Spirit." (Galatians 5:25)
When a person accepts the Lord Jesus Christ as Savior, believing on Him as the Son of God and personal Redeemer, the One who saves him from his sins, a wonderful event takes place. The Spirit of God enters his very body, there to reside and to guide his new life in Christ. Henceforth he is, whether he senses it or not, "in the Spirit." "Ye are not in the flesh, but in the Spirit, if so be that the Spirit of God dwell in you. Now if any man have not the Spirit of Christ, he is none of his" (Romans 8:9).
The believer's body even becomes a temple in which the Spirit can reign over his life. "What? know ye not that your body is the temple of the Holy Ghost which is in you, which ye have of God, and ye are not your own? For ye are bought with a price: therefore glorify God in your body, and in your spirit, which are God's" (1 Corinthians 6:19-20).
In addition to leading us (through the Scriptures which He inspired and through the circumstances which He ordains), "The Spirit |Himself| beareth witness with our spirit, that we are the children of God" (Romans 8:16). "Hereby know we that we dwell in him, and he in us, because he hath given us of his Spirit" (1 John 4:13).
The indwelling, comforting, leading, witnessing Spirit is not alone, for Jesus promised that, when the Comforter comes to "be in you," then through the Spirit, "I am in my Father, and ye in me, and I in you" (John 14:17, 20). Thus we can "be filled with all the fulness of God" (Ephesians 3:19).
Such a marvelous relationship will surely transform our lives. As today's verse exhorts us: "If we live in the Spirit" we should certainly "walk in the Spirit." The practical result is then obvious. "Walk in the Spirit, and ye shall not fulfil the lust of the flesh" (Galatians 5:16). HMM