[77] When, therefore, the mind walks abroad among the affairs of the ruler of the universe, it requires nothing further as an object of contemplation, since the mind alone is the most piercing of all eyes as applied to the objects of the intellect; but when it is directed towards those things which are properly objects of the outward senses, or to any passion, or substance, of which the land of Egypt is the emblem, then it will have need of skill and power in argument.