Philosophy can only be approached with the most concrete comprehension.
Philosophy is tested and characterised by the way in which it appropriates its history.
Philosophy as practice does not mean its restriction to utility or applicability, that is, to what serves morality or produces serenity of soul.
As a universal history of philosophy, the history of philosophy must become one great unity.
Even scientific knowledge, if there is anything to it, is not a random observation of random objects; for the critical objectivity of significant knowledge is attained as a practice only philosophically in inner action.
Only as an individual can man become a philosopher.
Everything depends therefore on encountering thought at its source. Such thought is the reality of man's being, which achieved consciousness and understanding of itself through it.
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.
I discovered that the study of past philosophers is of little use unless our own reality enters into it. Our reality alone allows the thinker's questions to become comprehensible.
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.
The community of masses of human beings has produced an order of life in regulated channels which connects individuals in a technically functioning organisation, but not inwardly from the historicity of their souls.
My own being can be judged by the depths I reach in making these historical origins my own.
Philosophic meditation is an accomplishment by which I attain Being and my own self, not impartial thinking which studies a subject with indifference.
Only then, approaching my fortieth birthday, I made philosophy my life's work.
At the present moment, the security of coherent philosophy, which existed from Parmenides to Hegel, is lost.