Both parties in communication must be purposeful.
Finally, note that both parties in communication must be purposeful. If we push a button to start a machine and the machine has no choice, communication has not taken place. On the other hand, if we push a button at the front door of a house, though we do not communicate with the bell we do communicate with the occupants of the house; both they and we have alternative ways of pursuing our objecteves. (PS l42)
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