The Egyptians then deliberately undertook to make instinctive a sense of social order, and of submission to what was established, and a disposition to comply with all the ordinary duties of morality as then understood, and which were set forth in the forty-two denials of sin the mummy would have to make at the day of judgment. All this they effected chiefly by their system of castes; and by the logical and practical manner in which they had worked out, and constructed, their doctrine of the future life; and had brought it to bear on the conduct, the thoughts, and the sentiments of every member of the community: and they effected it most thoroughly and successfully. And now we must advance a step further, and note some of the incidents that belonged to, and consequences that ensued on, what they did. We must bear in mind that their times were not as our times. The means they had to work with, the materials they had to work upon, and the manner in which they were obliged to deal with their means and their materials, necessitated the construction of an inelastic and iron system. This was necessary then and there. Like all the oriental systems, it altered not, and could not alter; and being thus inexpansive and unaccommodating, it besides, in its institution of castes, involved injustice at home; and, in its being for Egyptians alone, exclusiveness towards the rest of the world, which was, in a sense, the denial of the humanity of all who were not Egyptians. Being settled once for all, it abrogated human freedom. It rejected and excluded all additional light and knowledge; it denied all truth, excepting that to which it had itself already attained: that is to say, however good it may have been for its own time, it eventually, when brought into contact with a differently circumstanced, and advancing world, made immorality, injustice, falsehood, thraldom of every kind, and ignorance, essential parts of religion. This it was that caused its overthrow.