This great assertion is the fifth of the "I am" claims in John. "In him is life" (John 1:4), for He is the "Son of the living God" (Matthew 16:16).

Source:

KJV Defenders Study Bible, by Dr. Henry Morris, Ph.D.
Publisher: Thomas Nelson
Language: English
DEF 10 ISBN 0-529-10444-x
DEF 10-1 ISBN 0-529-10445-8