“He who believes in the Son has everlasting life; and he who does not believe the Son shall not see life, but the wrath of God abides on him.” John 3:36

Notes:

He who believes in the Son –  he whose object of faith and trust is in Christ Jesus, relies and commits himself to Him, expecting life and salvation from Him.

has everlasting life – has eternal life, living forever and ever without end.

he who does not believe the Son shall not see life – he who does not believe Jesus to be the Son of God (God incarnate or made flesh ), or the Messiah; or rejects him as the Saviour; will live and die in a state of impenitence and unbelief, neither enjoy true life or happiness here nor in the world to come. He shall never enter heaven.

but the wrath of God abides on him – the wrath, therefore, is not first initiated or developed by the refusal to believe, but is already there, and through that refusal; remains. On the refuser of Christ, the wrath of God instead of being removed from him by faith, abides through his unbelief and it will continue to remain on him for all eternity.

Further note:

As there is no way of escaping the wrath of God but by the Lord Jesus Christ, so those who will not believe must go to eternity “as they are” and bear alone the full consequence of the penalty of sin – joining the devil and his angels in hell**. Such is the wretched and terrifying condition of the sinner! Yet many choose to remain in this state, and to encounter all that is horrifying in the wrath of Almighty God, rather than come to Jesus, who has borne their sins in His own body on the cross, and who is willing to bless them with the peace and joy of immortal… never ending ….life.

** “Then He will also say to those on the left hand, ‘Depart from Me, you cursed, into the everlasting fire prepared for the devil and his angels:” Jesus said in Matthew 25:41