Refraining from talking

What should be done to refrain from talking?

Think! You have only to reflect a little more. If only you make it a habit to think before speaking, that saves you at least half of what you say. To think before speaking and to say only what seems absolutely indispensable to you—then you very quickly become aware that very few words are indispensable, except from the practical point of view, in work, when one is working with somebody and is obliged to use words: “Do this”, “Give me that”, or “Like this”, or “Like that”. And even so, this can be reduced to a minimum.

Ref : Questions and Answers 1954