“The true philosopher, . . . whose mind is on higher realities, has no time to look at the affairs of men, or to take part in their quarrels with all the jealousy and bitterness they involve. His eyes are turned to contemplate fixed and immutable realities, a realm where there is no injustice done or suffered, but all is reason and order, and which is the model which he imitates and to which he assimilates himself, as far as he can.”