What does the Bible say about the eternal security of believers?

According to Scripture, believers are assured of their eternal security through various means. Jeremiah 32:38-41 illustrates the everlasting covenant God makes, where He commits to being our God and ensuring our faithfulness. Moreover, passages like Ephesians 1:13 affirm that once you have believed, you are sealed with the Holy Spirit, guaranteeing your salvation. This means that your salvation does not hinge on your ability to maintain it, but on God's promise and faithfulness, which are unchanging.