From the Downtown Cornerstone Church blog:
In my personal and pastoral experience, there is no better way to keep the gospel central, clear and uncluttered than memorizing particular passages of scripture that deal explicitly with the gospel. The act of memorization forces you to define the gospel biblically. The result of memorization is that the gospel is now within you, ready to be recalled anytime you need some gospel encouragement or have an opportunity to share. Below are ten verses on the gospel to consider memorizing. You don’t have to memorize them all. Start with your three favorite verses and go from there.