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."
He that believeth ... he that obeyeth not ... These are among the most decisive words in the New Testament with regard to what is meant by "believeth," or "faith" as frequently used by New Testament writers.  In all instances, it is an OBEDIENT FAITH that is meant, and never is some special quality of faith apart from obedience intended.  Salvation by "faith alone" is an erroneous tenet of human creeds, but it is not the teaching of God's word.  He who does not obey the Son, in the practical sense, is an unbeliever; and all faith, of whatever degree, is dead without obedience.