Spiritual Exercises … It's a man's work on himself , which begins with the first Greek philosophers and reaching its apogee in the dialogue of Socratics and Platonics, Epicurus , Seneca , Epictetus , Marcus Aurelius , Plotin's treatises , Continued by later philosophers , such as Montaigne , Descartes , Kant , Michele , Bergson , Friedman and Foucault . And is not the essence of philosophy in this eternal doubt in our attitude to ourselves, to others and to the world? A new edition of the works of the great anti-Covan scholar Pierre Ado, Honorary Doctor of the Collge de France, is supplemented by studies published since the first publication of this work in 1981.. For a wide range of readers[edit] [ Published in Russian for the first time.