Romans 10:9-10 helps us understand that it is with our heart that we believe. What we believe about salvation has eternal value. Our salvation is forever. As John 10:28 says, “…neither shall anyone snatch them out of My hand.”
Our lives are integrally intertwined with the Lord’s death, burial, and resurrection. 1 Peter 1:3 says, “Blessed by the God and Father of our Lord Jesus Christ, who according to His abundant mercy has begotten us again to a living hope through the resurrection of Jesus Christ from the dead.”
Our heart is our belief center. Any doubt that enters our thoughts, is a fiery dart lie. So are thoughts of worry, fear, insecurity, and unbelief. They all are strategically designed to attack our faith.
1 Corinthians 15:58 is in the same chapter where the gospel is spelled out. It says, “Therefore, my beloved brethren, be steadfast, immovable, always abounding in the work of the Lord, knowing that your labor is not in vain in the Lord.” Think of our Living Savior as the Rock of our Salvation. His character is unchangeable.