actions speak louder than words

What you do is more important than what you say, or what you promise to do: “The gallant foreigner, who could not tell them how he sympathized with them, but whose actions spoke louder than words” (F. McCullagh, With the Cossacks, 1906).

 The first recorded use of the proverb, in the form “actions are more precious than

words,” was in a speech by the English politician John Pym in 1628. Its current form is of U.S. origin.

Proverb expressing similar meaning: 

deeds are fruits, words are but leaves.