Actions speak louder than words = What you do is more important than what you say.

A: “I’m going to join a gym and get in shape!”

B: “You have said that to me every summer for 3 years. Don’t tell me what you are going to do, show me. Actions speak louder than words.”

*I won’t believe it until I see it. Your words don’t have meaning (you said the same thing every year for 3 years but you didn’t DO anything!)
Actions speak louder than words