H. P. Grice: The corresponding function of practical argument should be to reach an intention or decision: and what should correspond to saying 'P", as an expression of one's belief, is saying 'I shall do A', as an expression of one's intention or decision.

 The corresponding function of practical argument should be to reach an intention or decision: and what should correspond to saying 'P", as an expression of one's belief, is saying 'I shall do A', as an expression of one's intention or decision.