As a universal history of philosophy, the history of philosophy must become one great unity.

When language is used without true significance, it loses its purpose as a means of communication and becomes an end in itself.

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.

Reason is like an open secret that can become known to anyone at any time; it is the quiet space into which everyone can enter through his own thought

Only as an individual can man become a philosopher.

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.

The great philosophers and the great works are standards for the selection of what is essential. Everything that we do in studying the history of philosophy ultimately serves their better understanding.