Don't talk the talk if you can't walk the walk. It means: talk is cheap, but can you follow through with action? It is similiar to: don't let your mouth write a check that your a** can't cash. Or (from the Baretta theme), don't do the crime if you can't do the time. I'll post again if I find more about the talk/walk origin. I've heard a variation used in a blues song, the singer talking about a girl that "talks that talk and walks that walk."
talk the talk 光说 walk the walk 做事
Don't talk the talk if you can't walk the walk.
别光说不练。
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