Jesus said in John 6, …I will not reject anyone who comes to me…for it is the will of the Father that everyone who sees the Son and believes in him may have eternal life and I will raise him up on the last day.
If Jesus said he will not reject us. There were no exceptions like “except you …. and then all bets are off”. No, he said if we believe in Him we would have eternal life. If we can accept what Jesus said, why do we lose hope? Paul said, hope does not disappoint because the love of God has been poured out and into our hearts. We did nothing to gain salvation. Christ dies for us while we were still sinners. We did nothing to deserve his death for our sins, and yet his death reaches to us for our whole life. We are now justified by his shed blood and we are reconciled to him for all of eternity.
Like David wrote in Psalm 23, there is nothing I need because He walks with me, provides for me, and even in death I do not need to fear.