This book is part of a series of separately titled books concerning the gospel of salvation based on the CORNERSTONE teachings of the Lord Jesus Christ and the FOUNDATION teachings of the apostles and prophets. It consists of 4 booklets. Booklet One reveals the true meaning of "to be baptized in Holy Spirit." Booklet Two reveals the true meaning of "Eating My flesh and drinking My blood." Booklet Three reveals the true meaning of the Lord Jesus Christ washing the feet of His disciples. Booklet Four reveals the true meaning of non-literal water in New Testament. There are two major different understanding of "baptism in Holy Spirit." One group of "Christians" believe that "baptism in Holy Spirit" is the same as "born from the Spirit" while the other group of "Christians" believe that "baptism in Holy Spirit" is different from "born from the Spirit." This is the reason for Booklet One. Many "Christians" believe that when the Lord Jesus Christ told the Jews to "eat My flesh and drink My blood" it was in reference to the partaking of the Lord's Table. This is the reason for this Booklet Two. There are also "Christian" groups who practice the literal washing of feet of other "Christians" to conform to the command of the Lord Jesus Christ in John 13:4-17. Is this practice in conformance to the true meaning of the Lord Jesus Christ' command? Booklet Three reveals the true meaning of the Lord's command to His disciples to wash each other's feet. Booklet Four is included to reveal the biblical meaning of the figurative usage of the word "water" in the New Testament Scriptures. If believers are to build up into the unity of the faith they must all have the same understanding of all the commandments and teachings of the Lord Jesus Christ otherwise any differents in understanding and practice of the commandments and teachings of the Lord Jesus Christ will lead to disunity and ultimately the total contamination of the gospel of salvation, which has already come to pass.