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material things we know as houses, clothes, food and drink. We who desire to work in Thought Substance must know something of its nature and possibilities, as the artist must know something about the mixing of colors and laying them upon the canvas.

If you wish to run a locomotive you must acquaint yourself with all its parts and learn their relation to each other. You must practice running your engine until you are expert in its management, before you are prepared to take out a train without accident.

On the contrary we have attempted to run a human engine of which we knew little or nothing, and naturally we have had our mishaps which we called diseases, and our engines have been in the repair shop far too much of the time. If the Master Engineer, the Universal Mind, had not occasionally given us a command or word of advice, there might not have been anything left of our engines to take to the repair shop.

The human engine is more complicated and difficult to understand than its iron brother, but it is possible to learn all about it and to keep it under perfect control. It takes time and study and perseverance, of course, but it is time and study and perseverance well spent. In fact it could not be better spent.

Is there any study that can compare with it? I should say not. Indeed it may well be made the first of all studies, for without health, peace of mind, and the ability to master circumstances, what can we accomplish in any direction? Our