One who believes in the Son has eternal life, but one who disobeys{The same word can be translated "disobeys" or "disbelieves" in this context.} the Son won't see life, but the wrath of God remains on him."

 3:14-15 And as Moses lifted up the serpent in the wilderness, so the Son of Man must be lifted up, that every one who believes in him may have eternal life. 