192-WATCH lest, when you do not meet a case, you assume that you need more scientific and more complicated tools, rather than a more effectual use of the simple ones which Science has already furnished you. If we could have peered into the thought of the Master and seen how he worked, we probably would have been surprised at the simplicity of his scientific thought, and the simple declarations he used. We should realize that the tools we have been given are sufficient for every need-just the simple facts of being which Science and Health teaches, with which we are already familiar. If a case does not yield, what is the trouble? Jesus' skill as a metaphysician lay in his ability to apply just the right tool to the right place, to resolve every problem into a form which could easily be met through the primitive rules of Christian Science. He had a simple faith, yet with it he could move mountains of belief. When one is confronted with the belief in death, if he is a metaphysician, he does not work directly against that claim. He traces it to a belief of birth into matter, and handles it there. When confronted with the claim of age, he resolves it into a belief in time and limitation, and handles that. Once the organist of The Mother Church had an accident on a Sunday morning. He tripped on some scaffolding and was rendered unconscious by a blow on the head. When he regained consciousness and was able to call his wife for help, he told her not to work on the belief of sensation and intelligence in matter, but on the claim of interference with the service about to be held. Soon he was restored, and was able to do his part in the service. If you possess the one key that opens a lock, what more do you want? But if you have many keys, you need skill in selection, to pick out the right one. A foreign substance might be put over the keyhole, to make you believe that there is no lock. Wisdom and expectancy are needed to know that the hole is there under such circumstances. But having the right key, and knowing where the hole must be, you can readily open the door. We must watch that we be not tricked into applying our understanding to a case on its face value. Error works by subtlety. It attempts to influence us in such a way that our work will be ineffective. That is why Mrs. Eddy once said, "The law of mortal mind that says our work, whatever it may be, will not amount to anything, must be broken .... Watch your own thought that you be not tripped and used as a channel to prevent the good work you are trying to do. This is most important, as the subtlety of evil is to prevent Truth from appearing. Another subtlety is the claim that to 'handle the serpent' will not do any good. Look well to this." Remember that there is always a vulnerable point in error, and spiritual perception will enable you to find it in each case. Then your simple tools will be found adequate.