Jesus said, "But the hour is coming, and now is, when the true worshipers will worship the Father in spirit and truth; for the Father is seeking such to worship Him. God is Spirit, and those who worship Him must worship in spirit and truth." - John 4:23-24
The purpose of this book is to show us how to experience and gain Christ in our daily living as the reality of all the different offerings. In Deuteronomy 16:16, God commanded His people not to come empty-handed when they go to Jerusalem to worship Him. They need to bring the different offerings when they come to keep the feasts in Jerusalem. God said that the offerings are His food (Num. 28:2). If all the believers would practice this priesthood by bringing the reality of Christ that they experienced to offer up to the Father every Lord's Day, then that would satisfy the Father. By doing so, the saints will also grow, mature, and be transformed in their spiritual life. The Father is still seeking such worshipers. This is God's wisdom for His believers to gain Christ in their daily living, to live Him, and be ready for His coming.