It is not enough to attain knowledge of the soul; any mystic may do that. It is necessary to attain clear knowledge. Only the philosophic mystic may do that. This emphasis on clarity is important. It implies a removal of all the obstructions in feeling, the complexes in mind, and obfuscations in ego which prevent it. When this is done, the aspirant beholds truth as it really is.
-- Notebooks Category 20: What Is Philosophy? > Chapter 4: Its Realization Beyond Ecstasy > # 168
-- Perspectives > Chapter 20: What Is Philosophy? > # 26