Kazimierz Twardowski was renowned as an outstanding philosopher, teacher, and organizer of academic life. No less famous was his style of work, depicted in many recollections of his students. In the paper, I present three aspects of good mental work: a) stoic inspiration for Kazimierz Twardowski's style of work, b) the place of the techniques of mental work in the program of pragmatic logic according to the views of Kazimierz Ajdukiewicz and Tadeusz Kotarbiński, and c) selected contemporary approaches consistent with the direction provided by the Lvov-Warsaw School. By exploring a new perspective in the study of good mental work by linking it to the ancient philosophy of life as well as to the most recent developments in the theory of good mental work, the paper reveals unexplored insights into the tradition of the Lvov-Warsaw School, demonstrating its significance, depth, and relevance to modern times.