1] The person who truly believes in Christ has new eternal life.
"For God so loved the world, that He gave His only Son, that whoever believes in Him should not perish but have eternal life." [John 3:16]
"Whoever believes in the Son has eternal life; whoever does not obey the Son shall not see life, but the wrath of God remains on him." [John 3:36]
"Truly, truly, I say to you, whoever hears my word and believes Him who sent me has eternal life. He does not come into judgment, but has passed from death to life." [John 5:24]
"Truly, truly, I say to you, whoever believes has eternal life." [John 6:47]
"I am the living bread that came down from heaven. If anyone eats of this bread, he will live forever. And the bread that I will give for the life of the world is my flesh." [John 6:51]
"Jesus said to her, "I am the resurrection and the life. Whoever believes in me, though he die, yet shall he live, and everyone who lives and believes in me shall never die.'" [John 11:25-26]
"I write these things to you who believe in the name of the Son of God that you may know that you have eternal life." [1 John 5:13]
"Since you have been born again, not of perishable seed but of imperishable, through the living and abiding word of God." [1 Peter 1:23]
2] All of the elect are kept secure for eternity in God by His power.
"Jesus said to them, 'I am the bread of life; whoever comes to me shall not hunger, and whoever believes in me shall never thirst. But I said to you that you have seen me and yet do not believe. All that the Father gives me will come to me, and whoever comes to me I will never cast out. For I have come down from heaven, not to do my own will but the will of Him who sent me. And this is the will of Him who sent me, that I should lose nothing of all that He has given me, but raise it up on the last day. For this is the will of my Father, that everyone who looks on the Son and believes in Him should have eternal life, and I will raise him up on the last day.'" [John 6:35-40]
"My sheep hear my voice, and I know them, and they follow me. I give them eternal life, and they will never perish, and no one will snatch them out of my hand. My Father, who has given them to me, is greater than all, and no one is able to snatch them out of the Father's hand." [John 10:27-29]
"And I am no longer in the world, but they are in the world, and I am coming to you. Holy Father, keep them in your name, which you have given me, that they may be one, even as we are one. While I was with them, I kept them in your name, which you have given me. I have guarded them, and not one of them has been lost except the son of destruction, that the Scripture might be fulfilled." [John 17:11-12]
"I do not ask that you take them out of the world, but that you keep them from the evil one." [John 17:15]
"For those whom He foreknew He also predestined to be conformed to the image of His Son, in order that He might be the firstborn among many brothers. And those whom He predestined He also called, and those whom He called He also justified, and those whom He justified He also glorified." [Romans 8:29-30]
"Who shall separate us from the love of Christ? Shall tribulation, or distress, or persecution, or famine, or nakedness, or danger, or sword? 36 As it is written, 'For your sake we are being killed all the day long; we are regarded as sheep to be slaughtered.' No, in all these things we are more than conquerors through him who loved us. For I am sure that neither death nor life, nor angels nor rulers, nor things present nor things to come, nor powers, nor height nor depth, nor anything else in all creation, will be able to separate us from the love of God in Christ Jesus our Lord." [Romans 8:35-39]
"Who will sustain you to the end, guiltless in the day of our Lord Jesus Christ." [1 Corinthians 1:8]
"He predestined us for adoption as sons through Jesus Christ, according to the purpose of His will." [Ephesians 1:5]
"In Him you also, when you heard the word of truth, the gospel of your salvation, and believed in Him, were sealed with the promised Holy Spirit, who is the guarantee of our inheritance until we acquire possession of it, to the praise of his glory." [Ephesians 1:13-14]
"And do not grieve the Holy Spirit of God, by whom you were sealed for the day of redemption." [Ephesians 4:30]
"And I am sure of this, that He who began a good work in you will bring it to completion at the day of Jesus Christ." [Philippians 1:6]
"Blessed be the God and Father of our Lord Jesus Christ! According to His great mercy, He has caused us to be born again to a living hope through the resurrection of Jesus Christ from the dead, to an inheritance that is imperishable, undefiled, and unfading, kept in heaven for you, who by God's power are being guarded through faith for a salvation ready to be revealed in the last time." [1 Peter 1:3-5]
3] The elect will persevere to the end in faith and obedience by the power of God.
"Whoever has my commandments and keeps them, he it is who loves me. And he who loves me will be loved by my Father, and I will love him and manifest myself to him.” [John 14:21]
"I am the true vine, and my Father is the vinedresser. Every branch in me that does not bear fruit he takes away, and every branch that does bear fruit He prunes, that it may bear more fruit. Already you are clean because of the word that I have spoken to you. Abide in me, and I in you. As the branch cannot bear fruit by itself, unless it abides in the vine, neither can you, unless you abide in me. I am the vine; you are the branches. Whoever abides in me and I in him, he it is that bears much fruit, for apart from me you can do nothing. If anyone does not abide in me he is thrown away like a branch and withers; and the branches are gathered, thrown into the fire, and burned. If you abide in me, and my words abide in you, ask whatever you wish, and it will be done for you. By this my Father is glorified, that you bear much fruit and so prove to be my disciples. As the Father has loved me, so have I loved you. Abide in my love. If you keep my commandments, you will abide in my love, just as I have kept my Father's commandments and abide in his love. These things I have spoken to you, that my joy may be in you, and that your joy may be full." [John 15:1-11]
"For we are His workmanship, created in Christ Jesus for good works, which God prepared beforehand, that we should walk in them." [Ephesians 2:10]
"And after you have suffered a little while, the God of all grace, who has called you to His eternal glory in Christ, will Himself restore, confirm, strengthen, and establish you." [1 Peter 5:10]
"Therefore, brothers, be all the more diligent to confirm your calling and election, for if you practice these qualities you will never fall." [2 Peter 1:10]
"Therefore, my beloved, as you have always obeyed, so now, not only as in my presence but much more in my absence, work out your own salvation with fear and trembling, for it is God who works in you, both to will and to work for His good pleasure." [Philippians 2:12-13]
"Not that I have already obtained this or am already perfect, but I press on to make it my own, because Christ Jesus has made me His own. Brothers, I do not consider that I have made it my own. But one thing I do: forgetting what lies behind and straining forward to what lies ahead, I press on toward the goal for the prize of the upward call of God in Christ Jesus. Let those of us who are mature think this way, and if in anything you think otherwise, God will reveal that also to you." [Philippians 3:12-15]
"No one born of God makes a practice of sinning, for God's seed abides in him, and he cannot keep on sinning because he has been born of God." [1 John 3:9]
"We know that everyone who has been born of God does not keep on sinning, but he who was born of God protects him, and the evil one does not touch him." [1 John 5:18]
"They went out from us, but they were not of us; for if they had been of us, they would have continued with us. But they went out, that it might become plain that they all are not of us." [1 John 2:19]
"And this is the promise that he made to us - eternal life." [1 John 2:25]