When someone is said to “have a heart” for something, it implies that this motivates him/her.  So, it is reasonable to assume that whatever motivates us truly is our heart.  So, what does that say about us?  Paul’s life was totally turned around by his change of heart.  He not only wanted to share the gospel—he believed he would be miserable if he didn’t share the gospel.  His heart was driven by Jesus’ heart.  What does that look like for us?