------------------------------------- What then are the lessons which the whole history teaches? To discover these was part of our original purpose,(1014) as well as to learn the facts and find the causes; to satisfy the longings of the heart, no less than the curiosity of the understanding. First, What has been the office of doubt in history? Has it been wholly an injury, a chronic disease? or simply a gain? or has it operated in both ways? Let us find the answer, by testing each of these theories of its office by means of the facts. The first of the three is that which has generally been held within the Christian church. It dates from the first ages of the church, and witnesses to a valuable truth. The sacred care with which the Christians treasured the doctrine, and spurned the attempts of heretics to explain it away, proves the strength of the conviction that they possessed a definite treasure of divine truth, introduced at a definite period. Their very want of toleration,(1015) the tenacity of their attachment to the faith, is a proof of their undoubting conviction concerning the historic verity of the facts connected with redemption, and the definite character of the dogmas which interpreted the facts. In later ages however, the same idea of sacredness has been extended by the Romish church to the mass of error which Christianity has taken up into itself in the progress of ages; and in Protestant countries has led to the attempt to restrain the thoughts of men even on the secular subjects most remote from religion, where the ancient sacred literature seemed to suggest any indirect information. The doubt on the part of religious men, of any progress being made by free thought, has often expressed itself too in the affirmation, that the history of unbelief shows an exact recurrence of the same doubts, without progress from age to age, and an intimation that new suggestions of doubt are only old foes under new faces.