A man ceases to be a beginner in any given science and becomes a master in that science when he has learned that... he is going to be a beginner all his life.
There is no truer and more abiding happiness than the knowledge that one is free to go on doing, day by day, the best work one can do, ... , and that this work is absorbed by a steady market and thus supports one's own life ... Perfect freedom is reserved for the man who lives by his own work and in that work does what he wants to do.
The aim of science is to apprehend this purely intelligible world as a thing in itself, an object which is what it is independently of all thinking, and thus antithetical to the sensible world.... The world of thought is the universal, the timeless and spaceless, the absolutely necessary, whereas the world of sense is the contingent, the changing and moving appearance which somehow indicates or symbolizes it.