The following lectures were delivered on different occasions. Those on Czeżowski, Tatarkiewicz, Ingarden, Elzenberg and Ossowska were meant as introductory remarks to a series of seminars entitled “Polish Value Theory” which took place at the University of Trento, Italy, in 1991. The lecture on Bocheński was a contribution to the “Colloquium in Honor of the 100th Birthday of J.M. Bocheński” at the University of Fribourg in 2002. The lecture on Kotarbiński arose from courses on ethics I taught several times at the International Academy of Philosophy in Liechtenstein slightly less than two decades ago. The lecture on Twardowski is a revised version of the main part of my talk entitled “Brentano, Twardowski, and Moral Philosophy” which I gave during a workshop on “Emotions and Moral Values” in Pamplona at the Universidad de Navarra in 2016.

I am deeply grateful to all those who shared with me their questions, comments and critical remarks on those and other occasions, and in particular to Liliana Albertazzi, Chiara Rustici, Jan Srzednicki, Roberto Poli, Edward Swiderski, Peter Simons, Josef Seifert, Guido Küng, Mátyás Szalay, Cheikh Gueye and Alejandro Vigo. Many, many thanks to Martin Cajthaml, Mariano Crespo and Volodymyr Turchynovskyy for their kind and steady support, and for all our philosophical exchanges over the years, especially for those involving questions of value theory. Special thanks are due to Peter McCormick for his friendship, his constant interest in Polish value theory, and his insights about its hidden aspects. I owe sincere thanks to Zdzisław Mach for his support. Once again I wish to thank Michael Jacobs for his devotion to the task of line-editing my lectures and my translation of Czeżowski’s paper.

The Trento lectures, along with the article by Czeżowski added in the appendix, were published in Czesław Porębski, Polish Value Theory. Five Lectures with Texts, Jagiellonian University Press, Cracow 1996. I thank the Jagiellonian University Press for granting permission to reproduce these lectures, and Ossolineum Publishing House for permission to use Czeżowski’s text. The lecture on Bocheński was published in Studies in East European Thought 55: 387–400, 2003. I thank Springer Verlag for permission to reproduce it here.

Cracow, October 2017Czesław Porębski