talk is cheap
It is very easy to talk about what one is going to do or what the correct course of action is, but it is much harder one actually puts those words into action. A: "I just need a little more time, and I can fix this whole mess—I swear!" B: "Talk is cheap, Bill. If you don't have this sorted out by Friday, you're fired." You keep saying you're going to start eating better and getting in shape, but talk is cheap.
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