“By this we know that we abide in Him and He in us, because He has given us of His Spirit.” I John 4:13 NASB
In this, “by this we know, statement John is teaching, if we are in Christ His Spirit is in us. In John 14:16 Jesus began teaching His disciples about the Holy Spirit. He said in John 14:16-17, “I will ask the Father, and He will give you another Helper that He may be with you forever; that is the Spirit of truth, whom the world cannot receive, because it does not see Him or know Him, but you know Him because He abides with you and will be in you.” Jesus closed this verse with a very interesting statement. He said that the Spirit abides with you now but one day will be in you. Prior to Pentecost the disciples, as well as the folks in the Old Testament, knew the Holy Spirit. However, Jesus said a day is coming when the Holy Spirit will be in you.
When Jesus began to conclude His teachings on the Holy Spirit He said in John 16:7, “But I tell you the truth, it is to your advantage that I go away; for if I do not go away, the Helper will not come to you; but if I go, I will send Him to you.” Jesus was saying, if I do not ascend, the Holy Spirit would not descend. After Jesus death, burial, and resurrection He spent forty days with His disciples opening their eyes to the scriptures. When the time came for Him to ascend to be with the Father He took them up onto the Mt. of Olives and instructed them what they should now do. Recorded in all four of the gospels and the beginning of the books of Acts Jesus instructed His disciples to go into the entire world and proclaim the gospel to all creation. However, Jesus knew that although they had spent three years with Him in ministry, and another forty days having their eyes opened to the scripture they were still incapable of fulfilling this task. They needed the Holy Spirit to empower them. Head knowledge of the things of God are useless on their own. We need the Holy Spirit to empower us to enact this knowledge and live it out. For this reason, Jesus instructed His disciples to go back into Jerusalem and wait for the promise of the Father, the power from on high, which is the Holy Spirit. (Luke 24:49).
The disciples obediently went back to Jerusalem waiting and praying for ten days for the promise of the Father. Then in a miraculous display of power and glory, the Holy Spirit fell and rested upon each one on the day of Pentecost. Now that the Holy Spirit had come, they were able to put the teachings of Jesus into action. Prior to the Holy Spirit’s coming, they were incapable.
Today, when one receives salvation by placing their faith in the person and work of Jesus Christ they immediately receive His Spirit. Romans 8:9 says, “However, you are not in the flesh but in the Spirit, if indeed the Spirit of God dwells in you. But if anyone does not have the Spirit of Christ, he does not belong to Him.” In other words, if you have the Son you have the Spirit and the Spirit has given you life. If you do not have the Son, you do not have the Spirit and therefore you do not have life. The very first act of the Spirit in a believer is to give them life-eternal life.
The Holy Spirit has many functions. He testifies of Jesus, He convicts, He teaches, He leads, He comforts, He empowers, He equips, and He gives gifts to the believer to enhance the work of the kingdom. According to I Corinthians chapter two, the Holy Spirit searches even the deep things of God and reveals those truths to those who are in Christ. Even the things that the, “eye has not seen and ear has not heard, and which have not entered the heart of man, all that God has prepared for those who love Him.” (I Corinthians 2:9).
Those who do not truly abide in Christ do not have the Holy Spirit. Since they do not have the Holy Spirit, they do not have life and are incapable of truly living for Jesus. They can try to live for Him but will utterly fail for they do not have the power. Not only will they be incapable of living for Jesus, the things of God as a whole will not make any sense to them. II Corinthians 2:14, says of the one who is unsaved and therefore void of the Holy Spirit, “But a natural man does not accept the things of the Spirit of God, for they are foolishness to him; and he cannot understand them, because they are spiritually appraised.” Only those who are truly saved can understand, and therefore apply the truths of God to their lives through the indwelling power of the Holy Spirit.