The Bible tells us that there are two kinds of spirits: holy and evil (1 Jn 4:1). Holy spirits belong to God; evil spirits belong to God’s enemy the devil. Humans have spirits as well, and God wants our spirits to resemble His own holy and living Spirit (Mt 5:48). Although God originally made the spirit of man in His own image (Gn 1:26-27), we were deceived by God’s enemy and we sinned (Gn 3:1-6, Gn 6:5), corrupting our spirits. The wages of sin is death (Rom 6:23), but through the redeeming sacrifice of Jesus on the cross, our debt of sin can be paid (1 Jn 2:2), and by being born again of the imperishable seed of God’s word (1 Pt 1:23), our spirit can be restored to God and life.
In addition, God sent the Holy Spirit into the hearts of His people on the day of Pentecost (Acts 2). This Holy Spirit united with the newly living spirits of the disciples and gave them the power they needed to testify the gospel to the ends of the earth (Acts 1:8). The Holy Spirit works within the hearts of believers to teach, convict, sanctify, comfort, strengthen, and encourage (Rom 8:26, 1 Cor 2:10-14, Gal 5:22-23, Eph 3:16); it also gives the power to speak God’s words on God’s behalf (2 Pt 1:21). But the Holy Spirit that came at the Pentecost was only a down payment of what God has promised us (2 Cor 1:22, 2 Cor 5:5, Eph 1:14). The fullness of God’s Holy Spirit will come upon us when we are fully changed (1 Cor 15:51-54), when the kingdom comes, and when God’s will is done on earth as it is in heaven (Mt 6:10, Rv 21:1-7).