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."

 (ii) But there may be another reason. The rabbis declared that the best time to study the law was at night when a man was undisturbed. Throughout the day Jesus was surrounded by crowds of people all the time. It may well be that Nicodemus came to Jesus by night because he wanted an absolutely private and completely undisturbed time with Jesus. 