Perfect certainty is what man wants. It cannot be found by practical doing or making jthese take effect in an uncertain future, and involve peril, the risk of misadventure, frustration and failure. Knowledge, on the other hand, is thought to be concerned with aregion of being which is fixed in itself. Being eternal and unalterable, human knowing is not to make any difference in it. It can be approached through the medium of the appre- hensions and demonstrations of thought, or by some other organ of mind, which does nothing to the real, except just to know it.