What does the phrase ''What you do has far greater impact than what you say'' mean

It means that actions speak louder than words.

Explanation:

Imagine that someone says to you "I'll visit soon, I swear!",

but never come and visits. You can't ever seem to rely on what this person says!

Then imagine someone else says the same thing, but they come down to visit you a couple of days after. This person followed through on their promise by acting - and actually visiting you. You can always trust this person because their actions speak for them! You can do a lot of talking, but ultimately your actions are what speak for you!

idk= i don't know the answer