The period of life is very uncertain, and at the longest is but short; a few years bring us from infancy to manhood, a few more to a dissolution; pain, sickness and death are the necessary consequences of animal life. Through life we struggle with physical evils, which eventually are certain to destroy our earthly composition; and well would it be for us did evils end here; but alas! moral evil has been more or less predominant in our agency, and though natural evil is unavoidable, yet moral evil may be prevented or remedied by the exercise of virtue. Morality is therefore of more importance to us than any or all other attainments; as it is a habit of mind, which, from a retrospective consciousness of our agency in this life, we should carry with us into our succeeding state of existence, as an acquired appendage of our rational nature, and as the necessary means of our mental happiness. Virtue and vice are the only things in this world, which, with our souls, are capable of surviving death; the former is the rational and only procuring cause of all intellectual happiness, and the latter of conscious guilt and misery; and therefore, our indispensable duty and ultimate interest is, to love, cultivate and improve the one, as the means of our greatest good, and to hate and abstain from the other, as productive of our greatest evil. And in order thereto, we should so far divest ourselves of the incumbrances of this world, (which are too apt to engross our attention) as to inquire a consistent system of the knowledge of religious duty, and make it our constant endeavor in life to act conformably to it. The knowledge of the being, perfections, creation and providence of God, and of the immortality of our souls, is the foundation of religion; which has been particularly illustrated in the four first chapters of this discourse. And as the Pagan, Jewish, Christian and Mahometan countries of the world have been overwhelmed with a multiplicity of revelations diverse from each other, and which, by their respective promulgators, are said to have been immediately inspired into their souls by the spirit of God, or immediately communicated to them by the intervening agency of angels (as in the instance of the invisible Gabriel to Mahomet) and as those revelations have been received and credited, by afar the greater part of the inhabitants of the several countries of the world (on whom they have been obtruded) as super-naturally revealed by God or angels, and which, in doctrine and discipline, are in most respects repugnant to each other, it fully evinces their imposture, and authorizes us, without a lengthy course of arguing, to determine with certainty, that not one of them had their original from God; as they clash with each other, which is ground of high probability against the authenticity of each of them.