The two New Testament books of the Bible that I cannot be without are John and Acts!
I. "John," because he made this statement in John 1:29 "...BEHOLD, the LAMB of GOD, which taketh away the sin of the world." Without JESUS' coming and dying for our sins, where would we be?
II. "Acts" is the other New Testament book of the Bible I could not be without because the "Promise" (John 14:26; 16:13) was fulfilled on the Day of Pentecost (Acts 2:2) in which our "Helper" (aka Holy Spirit) came which "leads and guides us into ALL truth" and the FIRST CHURCH (which we should be following under the New Covenant), was established! Where would we be without the HELP of the Holy Spirit?
If you don't know I'll tell you: Reading "the letter" (II Corinthians 3:6) and following "teachings" established by RELIGION as MOST "Christians" do!
They should have "WAITED" (Acts 1:4)!