The Three Principles are MIND, CONSCIOUSNESS, and THOUGHT.
They are described by Sydney Banks in his book, The Missing Link as “…spiritual gifts that enable us to see creation and guide us through life. All three are universal constants that can never change and never be separated. All philosophies are born via these three gifts and are a direct result of the correct or incorrect usage of these same principles. All psychological functions are born from these three principles. All human behavior and social structures on earth are formed via Mind, Consciousness and Thought.”
More information can be found on Sydney Banks’ website