The Old Testament is mainly built upon a great and detailed system of types, symbols and parables. This method runs on into the New Testament so far as the four Gospels and the Apocalypse are concerned, but with one over-ruling difference. The New Testament expounds and explains the Old, and, in this supreme matter of life, it overwhelms us with the revelation that that Tree of Life is but a type and symbol of a Person, namely, God's Son, Jesus Christ. On this point - focal point - a precise and inclusive statement is made by the Apostle John in his first Letter: And the witness [or testimony] is this, that God gave unto us eternal life, and this life is in his Son. He that hath the Son hath the life; he that hath not the Son of God hath not the life" (1 John 5:11,12). That is categorical. The whole letter must be read in the light of that statement. It makes everything Christo-centric. It puts human destiny upon His being the centre. It sums up the whole issue of life - or death - in Him!
Life in Christ, and Christ as the Life, is the horizon of all things.