The way to attain maturity in the faith is to have a balance of doctrine and spirituality. We must be zealous to hear, read, and study God’s Word, and we must be equally zealous to pray, worship God, and have fellowship with one another.
The doctrine of Jesus Christ: Jesus died, was buried, and rose again for our salvation. He is both Lord and Messiah—both the one true God and the sinless, perfect, anointed Man through whom God reveals Himself to us. In other words, Jesus is the Lord Jehovah, the God of the Old Testament, manifested in flesh to be our Savior. (See Acts 2:21-36; Colossians 2:9-10.)
The doctrine of eternal judgment: The Lord is coming back for His people. The righteous will inherit eternal life; the unrighteous will inherit eternal death. (See Acts 2:19-21; Revelation 22:12-21.)
Thus, Acts 2:38 is the comprehensive answer to an inquiry about New Testament conversion, expressing in a nutshell the proper response to the gospel. Not only did Jews from many nations on the Day of Pentecost receive the Acts 2:38 experience, but so did all other converts in the New Testament, including the Samaritans, the apostle Paul, the Gentiles at Caesarea, and the disciples of John at Ephesus.
Holiness is not a means of earning salvation but a result of salvation. We do not manufacture our own holiness, but we are partakers of God’s holiness (Hebrews 12:10). We are not saved by adherence to certain rules but by our faith relationship with Jesus Christ, which issues forth in obedience and produces spiritual fruit.