Abstract

This paper proposes a concept of "valid reasoning" that will apply univocally to reasoned judgment (inference), Reasoned decision (choice), And reasoned withholding of judgment and decision. "reasoning" is taken to include all these; "validity" of reasoning is defined in terms of the "ideally rational mind", Which is in turn defined by a modal logic of judging and deciding. The definition is defended by relating it to another ideal, That of the socratically omniscient and stoically omniscient sage, Who is defined by a modal logic of knowing and doing. In the course of this I distinguish between the vehicle and the description of a mental act, Deny that reasoning is a transition, Analyze doing as causing to be, And maintain that, Since doing stands to deciding as knowing stands to judging, Reasoned decision is genuinely practical reasoning