It has been said that ideas rule mankind. This is but a half-truth, but be it as it may, it can be unhesitatingly asserted that ideals rule the traveller on this quest. If they do not, then he is not embarked on the quest. But an ideal is only an abstract conception. Unselfishness, freedom, goodness, and justice are intangibles, and their practical application has altered from age to age according to the conditions prevailing in different times and places. An ideal must have a concrete shape or it becomes sterile.
-- Notebooks Category 6: Emotions and Ethics > Chapter 1: Uplift Character > # 82