Whoever believes in him is not condemned, but whoever does not believe stands condemned already because they have not believed in the name of God's one and only Son.
NIV
He who believes in Him [who clings to, trusts in, relies on Him] is not judged [he who trusts in Him never comes up for judgment; for him there is no rejection, no condemnation--he incurs no damnation]; but he who does not believe (cleave to, rely on, trust in Him) is judged already [he has already been convicted and has already received his sentence] because he has not believed in and trusted in the name of the only begotten Son of God. [He is condemned for refusing to let his trust rest in Christ's name.]AMP
He that believeth on him is not condemned: but he that believeth not is condemned already, because he hath not believed in the name of the only begotten Son of God.
KJV
For if their rejection brought reconciliation to the world, what will their acceptance be but life from the dead?
NIV
For if their rejection and exclusion from the benefits of salvation were [overruled] for the reconciliation of a world to God, what will their acceptance and admission mean? [It will be nothing short of] life from the dead!
AMP
For if the casting away of them be the reconciling of the world, what shall the receiving of them be, but life from the dead?
KJV
So that, "they may be ever seeing but never perceiving, and ever hearing but never understanding; otherwise they might turn and be forgiven!"
NIV
In order that they may [indeed] look and look but not see and perceive, and may hear and hear but not grasp and comprehend, lest haply they should turn again, and it [their willful rejection of the truth] should be forgiven them. [Isa. 6:9, 10; Matt. 13:13-15.]AMP
That seeing they may see, and not perceive; and hearing they may hear, and not understand; lest at any time they should be converted, and their sins should be forgiven them.
KJV