Nature forces everyone to move forward in life. The person who thinks is not content with living as a plant, but wants to overcome and develop their mental capacity. This development is only possible when the individual raises the quality of their thoughts and ideals and, consequently, their acts and circumstances. It is extremely important to study the creative process of thinking and know how to apply it. Thanks to this knowledge, the degree of evolution of human life on Earth will increase. Thought is the spiritual power of the cosmos that works through its creation: man. THE MASTER KEY SYSTEM teaches how to use that power constructively and creatively. This work constitutes the guide and the explanation of such process. THE MASTER KEY SYSTEM will give you a better personality and will provide you with a new power to achieve any personal purpose and a renewed ability to enjoy the beauty and wonder of life. - F. H. Burgess