XL. From the foregoing exposition of the characters of prophecy it will appear obvious, that those are greatly mistaken, who think that the exclusive or even the principal ministry of the prophet consists in foreseeing and foretelling future events. The prophet may occasionally find it necessary to his ends to predict some events, which he does by virtue of the Divine spirit infused in him; but this is for him only an accessory means to the chief object, which is to propagate and promote among men divine knowledge and religious life. With an all-wise provision, God disposed that, as a rule, the future shall remain hidden from mortals, that they may exert themselves to render it propitious by their good actions; and if He sometimes permitted, as an exception, that it should be revealed to them through the dispensers of His word, it was not to gratify an idle curiosity, but to excite men to worthily conform their works to coming events. CHAPTER VI. XLI. THE preliminary notions hitherto set forth are to be regarded as placed in the vestibule leading to the temple of Revelation. Now, before we cross the threshold, it may be well to meet at once an objection which will possibly be offered by modern incredulity. It is fashionably said, that rational man can admit nothing as true except that which is proved to him by logical demonstrations; and as for the acceptance of a revealed religion faith is a necessary element, and this must exclude (as commonly pretended) every kind of proof, therefore all reasoning is out of the question, and the very basis of that which is sought to be inculcated as a truth, renders it inadmissible. Such an objection, however erroneous in reality, has too grave an appearance, and its consequences would be too lamentable, to permit us to disregard it. It becomes, therefore, indispensable, before entering the sanctuary of Revelation, to remove the obstruction of such an error, even at the cost of a digression from our path, in order to consider the matter in its origin. XLII. One of the primary laws of existence in the physical world is self-love; that is, an instinct in every creature to procure its own good, even at the expense of others, so that the preservation of one is attended with the destruction of some others. All nature is in a perpetual struggle within itself, and every component part receives the elements of its own life and increment from the destruction of others. This we see repeatedly happen under our own eyes, as well in plants as in animals, and so evidently, that we need not here record instances to confirm it. It is through this contrast of individual interests, through this perpetual alternation of production and growth with decrease and destruction, that Providence ordained the preservation of the world in its totality, while the individuals perish and the species remain.