Which expression indicates that one should prove capability through action?

The expression that indicates one should prove capability through action is often recognized as "Actions speak louder than words." This phrase emphasizes that what a person actually does is a more reliable indicator of their intentions or abilities than what they merely say. It suggests that actions carry more weight and significance than verbal claims or promises.

In contexts where individuals might boast about their skills or plans, this expression serves as a reminder to back up those statements with concrete actions. By focusing on the notion that deeds are a truer reflection of one's capabilities, it encourages a proactive approach to demonstrating competence and reliability.

The other expressions also touch on similar themes regarding the value of action versus words, but the clarity of the selected phrase is best suited for expressing this particular idea of proving one’s capabilities through tangible actions.