7th. Reason, then, is the mean whereby we attain to faith, and escape the devil worship of idolatry; but the understanding is not a necessary condition of faith, and very often impedes it; for the understanding having for its basis the reports of sense and experience, has no direct way of arriving at things invisible, and rather shrinks back from that world with which it is in no way familiar. It has a work to do in regard to revelation, and an important work; but divine things not being its proper matter, its work concerning them must be subordinate, and its tendency is always to fall back from the invisible to the visible,--from matters of faith to matters of experience. Its work, with respect to revelation, is this--that it should inquire into the truth of the outward signs of it; which outward signs being necessarily things visible and sensible, fall within its province of judgment. Thus understanding judges the external witnesses of a revelation: if miracles be alleged, it is the business of understanding to ascertain the fact of their occurrence; if a book claim to be the record of a revelation, it belongs to the understanding to make out the origin of this book, the time when it was written, who were its authors, and what is the first and grammatical meaning of its language. Or, again, if any men profess to be the depositaries of divine truth, by an extraordinary commission from God, the understanding, being familiar with man's nature and motives, can judge of their credibility--can see whether there are any marks of folly in them, or of dishonesty, or whether they are at once sensible and honest. And in all such matters, the prerogative of the understanding to judge is not to be questioned; for all such points are strictly within its dominion; and our Lord's words are of universal application, that we should render to Cæsar the things which are Cæsar's, no less than we should render to God the things that are God's.