One does not easily discard the various passions. The decision to do so does not lead, or even contribute much, to their conquest. It merely announces the beginning of a long war. They return, in spite of one's wishes, again and again for they belong to the animal body which, itself, cannot be discarded. But in the end a man must claim his birthright to a higher kind of life, must fulfil his nobler possibilities, must set up reason and intuition as his most reliable guides.
-- Notebooks Category 6: Emotions and Ethics > Chapter 4: Purify Passions > # 6