Assurance of Salvation Is God’s Promise

When Jesus responded to the thief, He didn’t say, “maybe you’ll be with me” or “hopefully if you’re good enough” or “we’ll see how things go.” He made an absolute, unconditional promise: “Truly I say to you, today you will be with me in Paradise.” Today. Not eventually, not possibly, but today. This certainty is available to every believer. God’s Word tells us, “These things are written that you may know that you have eternal life”—not guess, not hope, but know. Yet so many Christians struggle with assurance, just like William Cowper who wrote the great hymn “There Is a Fountain Filled With Blood.” Despite his glorious conversion and beautiful faith expressed in his hymns, Cowper battled depression and mental illness his entire life, and he often doubted whether someone like him could truly be saved. But our assurance doesn’t rest on how we feel on any given day or whether we’re struggling with doubts or difficulties. Our assurance rests on the faithful promise of Jesus Christ. When you trust in Him, you can know you have eternal life—not because you’re perfect, not because you never struggle, not because you always feel saved, but because Jesus keeps His promises. He said that whoever believes in Him will not perish but have everlasting life. If you’ve placed your faith in Christ, you have the same promise the thief received. When your time comes to die, you will be with Him in Paradise.