Assuming that you are willing to follow such a course of study as we have sketched, either to remove doubts which may be lingering in your own mind, or to aid some brother in his struggle to win the repose which you have gained, we shall, at the outset, offer some suggestions as to the spirit and the method by which your work should be characterized. It is of much importance to know, what is, and what is not, within our reach. 1. Do not assume the possibility, in the present state of our knowledge, of demonstrating a perfect agreement between science and scripture, or rather between the inferences of the philosopher and the interpretations of the theologian. Much remains to be ascertained before that result can be realized. The natural sciences are confessedly incomplete; some of them are only in their infancy, and can teach us little. Many years may pass before they can be brought into perfect accord with the Bible. As the facts of natural science have not been all ascertained and classified, as its laws have not been all recognized, and as the inferences of to-day may be modified by the discoveries of to-morrow, it is absurd to be demanding immediate evidence of a perfect agreement between science and scripture. Apparent contradictions are, at the present stage unavoidable. There must first be an exact and exhaustive examination of all those points at which the scriptures and the sciences touch each other; for so long as a single fact or a single law remains unknown, some important or essential truth, intimately related to the Bible, may be concealed. While the natural sciences continue incomplete, natural theology must necessarily have an imperfect foundation. As confessedly dependent on what is incomplete, natural theology can have neither the comprehensiveness nor the definiteness which characterizes supernatural theology, as dependent on what is now complete and unvarying. We can not force the legitimate yet somewhat incoherent teachings of the one book—the works of God—of which but a few leaves have been separated, scanned and paged, into perfect harmony with the teachings of the other book, whose revelation of truth has been finished, accredited, and closed.