We know the Holy Spirit is in us because, as believers, we have received the Spirit of God who indwells us, confirming our status as children of God.
The presence of the Holy Spirit in believers is a central theme in the New Testament, particularly highlighted in John 14:17, where Jesus promises that the Spirit will dwell within His followers. This indwelling is evidence of being a believer, as Paul indicates in Romans 8, where he discusses the conflict between the flesh and the Spirit. The very fact that believers experience this inner struggle is a testimony to the Holy Spirit’s active presence, which empowers, convicts, and leads them in their Christian walk. Without the Holy Spirit, one's claim to Christ is invalid, for the Holy Spirit's presence is what unites us to Christ and assures us of our salvation.
Scripture References:
John 14:17, Romans 8:9-11, Romans 8:9, John 14:16-17
Commentary