How do we know that salvation is everlasting according to the Bible?

Scriptural evidence of the everlasting nature of salvation can be seen in verses like Isaiah 45:17, which states that Israel shall be saved in the Lord with an everlasting salvation. Salvation is not based on human efforts but is rooted in God's eternal plan and grace. In John 3:16, we learn that believers in Christ have eternal life, indicating that it cannot be lost or removed. The nature of this salvation is everlasting because it’s rooted in the character and promise of the everlasting God, ensuring that it will be fulfilled perfectly and completely.