Originally posted by: HotChic
There isn't a formal definition, consistent throughout all Christianity, by which Christians can provide you an answer. Some read the scriptures very straightforwardly, others see many shades of meaning, various places and times, etc. No one person can know with any more certainty than any other.
For what it's worth, here's the verse that came to my mind when I read your question:
Luke 23
39One of the criminals who hung there hurled insults at him: "Aren't you the Christ? Save yourself and us!"
40But the other criminal rebuked him. "Don't you fear God," he said, "since you are under the same sentence? 41We are punished justly, for we are getting what our deeds deserve. But this man has done nothing wrong."
42Then he said, "Jesus, remember me when you come into your kingdom."
43Jesus answered him, "I tell you the truth, today you will be with me in paradise."