EN
The author compares the theory of moral behavior presented by Boguslaw Wolniewicz in his article 'Hedonism and Duty' with a theory of such behavior contained in the author's treatise on 'Sense and Truth in Ethics'. The author tries to show that the main source of the difference between them lies in the conception of moral cognition, as assumed by these theories; in contradistinction to Wolniewicz, the author ascribes to such cognition, besides descriptive, an emotive and prescriptive content. This makes it possible to explain moral motivation without recourse to the concept of character - essential in Wolniewicz's theory.