Because God gives us eternal life through Jesus Christ, the true believer is secure in that salvation for eternity. If you have been genuinely saved, you cannot "lose" it. Salvation is maintained by the grace and power of God, not by the self-effort of the Christian. It is the grace and keeping power of God that gives us this security.
John 10:27-29*
My sheep listen to my voice; I know them, and they follow me. [28] I give them eternal life, and they shall never perish; no one can snatch them out of my hand. [29] My Father, who has given them to me, is greater than all; no one can snatch them out of my Father's hand.
2 Timothy 1:12
That is why I am suffering as I am. Yet I am not ashamed, because I know whom I have believed, and am convinced that he is able to guard what I have entrusted to him for that day.
Hebrews 7:25
Therefore he is able to save completely those who come to God through him, because he always lives to intercede for them.
Hebrews 10:10
And by that will, we have been made holy through the sacrifice of the body of Jesus Christ once for all.
Hebrews 10:14
...Because by one sacrifice he has made perfect forever those who are being made holy.
1 Peter 1:3-5
Praise be to the God and Father of our Lord Jesus Christ! In his great mercy he has given us new birth into a living hope through the resurrection of Jesus Christ from the dead, [4] and into an inheritance that can never perish, spoil or fade--kept in heaven for you, [5] who through faith are shielded by God's power until the coming of the salvation that is ready to be revealed in the last time.
