Of course it is quite true to say that the truth is inside man, that he must search there. But it is also true that the truth is outside man and in the cosmos itself because he is a part of it. Why be one-sided and reject the second direction in favour of the first or reject the first in favour of the second? Both are necessary to the full perception of truth.
-- Notebooks Category 20: What Is Philosophy? > Chapter 4: Its Realization Beyond Ecstasy > # 105