Think about what it means to have something “written on your heart.” Your heart is at the core of who you are—metaphorically as well as physically too. Whatever is written there would probably reflect what was most important and valued.
So... what would be written on your heart? Is the gospel part of the core of who you are? Does your relationship with the Savior motivate you to do what you do each day?
And it’s never too late for a change of heart, by the way. Today is a great day to begin building a more authentic relationship with Jesus Christ!