In Matthew 19:26, Jesus talks about a young ruler and says that it will be hard for him to enter heaven. As a result, he challenges the rich young ruler to think about what distractions are preventing him from gaining salvation. He then says that with God, all things are possible.
The rich young ruler is a great bible story for Sunday school lessons. It can be told easily and can be followed up with discussion. You may wish to ask the students to compare this story to the 10 Commandments. This can lead to a different branch of the story. The bible story can be found in Matthew 19:16-30 and we used the King James Bible.