O sztuce szczęśliwego życia

The presented study is of particular significance to me. It is dedicated to Professor Andrzej Jaczewski, a person very important to me. He is my Master and Friend. I have written about Professor Jaczewski many times, most often on the occasion of his jubilees and other significant events. However, this text is particularly difficult because the Professor is no longer with us. He will not tell us anything, advise us, criticise ... All this means that, despite the fact that this study is included in a scientific journal, it is not free from a subjective view, from very personal reflections. I hope that the image of the Professor and his achievements will not lose, but rather gain.