I love the account of the man on the cross next to Jesus who believed. The gospel really is that simple. Just believe. It's not a consideration or a thought, but real faith. This man had faith in Jesus and made an expression of it. Just faith exercised. It's all grace. Salvation is all God's doing. He knew his sin, he knew his need of forgiveness, and he asked. That's it. Done deal.
One of the criminals who hung there hurled insults at him: "Aren't you the Christ? Save yourself and us!" But the other criminal rebuked him. "Don't you fear God," he said, "since you are under the same sentence? We are punished justly, for we are getting what our deeds deserve. But this man has done nothing wrong." Then he said, "Jesus, remember me when you come into your kingdom.