Today, I heard Paul Washer preach these words: “I don’t have to know your heart. I just need to see what you do with your body and what you do with your body will tell me exactly what’s going on in your heart.”

Matthew 7:20 “Wherefore by their fruits ye shall know them.” source 

Our actions matter. Our body does indeed speak. 

Matthew 7: 20 in context – click HERE.

This is the sermon from which came the aforementioned quote.
This is a lengthy sermon by the standards of men but for the Love of GOD worth every second to me.