In his first letter to the churches, the Apostle John emphasizes the importance of love and the indwelling of the Holy Spirit. In chapter 4, he writes about the assurance that comes from knowing that we have the Spirit of God living in us. Through the Spirit's presence, we can have confidence that we belong to God and that He is working in us to produce His fruit in our lives. This verse serves as a reminder of the Holy Spirit's role in our lives as believers.
In the Old Testament, the Holy Spirit would empower certain individuals for specific ministries or offices but could withdraw if the person grieved or disobeyed the Lord. Even the presence of God left the temple in Jerusalem due to Israel's disobedience. However, in this Church dispensation, every believer in Jesus receives the incomparable gift of the permanently indwelling Holy Spirit as proof that we live in Him and He in us.
Despite no one having seen God, the Father sent the Holy Spirit to work through all who trust in the Son for salvation by grace through faith. This miraculous gift allows us to live in constant communion with God and fulfill His purposes in our lives.

Dear Heavenly Father,  I thank You for the gift of Your Holy Spirit, who dwells within me and testifies to my spirit that I belong to You. Help me to recognize the importance of this precious gift and to be sensitive to the leading of Your Spirit. May Your love be perfected in me, and may I be a vessel through which Your love is shown to others. I pray that You will guide me by Your Holy Spirit to live a life that is pleasing to You and that brings glory to Your name. 
In Jesus's name I pray. Amen.