João 3:18

He that believeth on him is not judged: he that believeth not hath been judged already, because he hath not believed on the name of the only begotten Son of God.

The change of tense in this verse, regarding the believer who is not judged, and the unbeliever who hath been judged already, is very significant. The believer is not judged, because he is "in Christ," totally identified with Christ and as Christ, being therefore not subject to judgment, but being "perfect in Christ" (Colossians 1:28). On the other hand, the unbeliever is under the uttermost condemnation, not merely from the fact of all people being lost apart from Christ, but from the additional reason of his having rejected the only means of grace and salvation.

Only begotten ... from the aspect of the Father expresses the unique relationship between the Father and the Son; and from the human viewpoint, this pinpoints the singleness of mortal hope in the fact that there is none other name under heaven given among men whereby we must be saved.