From early youth I endeavoured to read books in the right way and I was fortunate in having a good memory and intelligence to assist me. From that point of view my sojourn in Vienna was particularly useful and profitable. My experiences of everyday life there were a constant stimulus to study the most diverse problems from new angles. Inasmuch as I was in a position to put theory to the test of reality and reality to the test of theory, I was safe from the danger of pedantic theorizing on the one hand and, on the other, from being too impressed by the superficial aspects of reality.

The experience of everyday life at that time determined me to make a fundamental theoretical study of two most important questions outside of the social question.