Never yet has science reached to the great reason of all reasons, to the great cause of all causes, that underlies all knowledge; and yet ever as we seek for it we are advancing in knowledge. We do not reach it, but are ever reaching and passing on, through that which lies between us and it. Doubt is like the mainspring of a watch, it is ever seeking to uncoil itself and yet never entirely doing so. The result is that the hands of the watch move uniformly because there is an attachment of the mainspring. Cut the attachment, and the hands will give one wild whirl and all will be still, and the watch useless. It is just the same with doubt and faith. Doubt is attached to the primary belief that there is a cause of all things, but it is ever seeking to detach itself from that belief and never succeeds. The consequence is, that there is a constant and measured progress of the human mind. But we have to consider how much further the intellect which has thus been the rule and test of our belief might go. A child not only believes in appearances or facts, but he has an instinctive belief in the truthfulness of humanity. The child has not learned that it is not wise to believe everything that is said to him. Was that a happy discovery? Should we tell a child not to believe the word of any human being until he had demonstration about it? Is it wisdom always to distrust human nature? We are always trusting. Give a logical proof that we are right in any of our trusts. A wife may be false, a child may hate its parents, and a man may be robbed by a friend or a confidential servant; yet are we to distrust everybody? If a man were not to trust any one till it was proved by demonstration that he ought to do so, he would be put in a lunatic asylum; and rightly so, as a man one part of whose nature had got diseased and had mastered all the other parts of his nature. I defy any one to say logically that the man may not be right, or to give a logical demonstration that it is absolutely impossible that his wife, children, and friend were not in a conspiracy to wrong him. There is thus an absolute necessity for trust in the ordinary affairs of life, I hope you will see that life must be conducted on the principle of faith or trust.