Leaving aside the too grossly materialistic persons, who are without any moral principles or social conventions, if we take the right type of civilized man, then we find that he is engaged in some type of religious principle. It doesn't matter if he is Christian, Moslem or Jew, the symptom of a civilized man is that he must have the recognition of religious principles; that is required for civilized man.
Letter to Janardana, 2 March, 1969