The Parable of the Workers in the Vineyard is a convicting one to me. I've been a Christian my entire life, and can relate to the workers who worked all day long only to find out that the workers who came late in the day earned the same wage as they had after their long day's worth of work. "Not fair!"
But the fact is, eternal life is granted to every believer, whether they've been a Christian all their lives or whether they become a believer on their death bed. The thief on the cross received the same reward of eternal life as Moses or the apostle Paul.
God's gift of salvation is an incredible act of grace and we need to remember to be grateful for the grace we have received, and not begrudge anyone else their own gift of grace.
Yes, there are different rewards in heaven, but the reward of eternal life is given to every believer.
Tomorrow's Bible In a Year Passage: Psalms 19-21, Matthew 21:1-27