(philosophy) The use of reason to decide how to act.
Practical-reason Sentence Examples
Such is the train of thought as stated for us in the Critique of Practical Reason.
His criticism of Wolff, which is generally based on sound sense, had much influence upon Kant at the time when his system was forming; and his ethical doctrines are mentioned with respect in the Kritik of Practical Reason.
Indirectly, indeed, Kant had indicated a very definite opinion on theology: from the Critique of Pure Reason it was clear that for him speculative theology must be purely negative, while the Critique of Practical Reason as clearly indicated the view that the moral law is the absolute content or substance of any religion.
Kant first deduced that from the experience of mental phenomena all logical use of reason is limited to mental phenomena, and then maintained that to explain moral responsibility practical reason postulates the existence of real noumena.
But what is a postulate of practical reason to explain moral responsibility except a logical use of reason ?