I began the study of medicine, impelled by a desire for knowledge of facts and of man. The resolution to do disciplined work tied me to both laboratory and clinic for a long time to come.

If philosophy is practice, a demand to know the manner in which its history is to be studied is entailed: a theoretical attitude toward it becomes real only in the living appropriation of its contents from the texts.

Only then, approaching my fortieth birthday, I made philosophy my life's work.

Only then, approaching my fortieth birthday, I made philosophy my life's work.