Meta. By the term Mind, we mean God--the universal principle of causation, which includes all principles. Mathematics is a principle that in its field illustrates the exact and inexorable laws that are one with the manifestations of God, or Mind.
There is nothing but Mind and thought--Principle and its mode of expression. The things made, or externalized, are simply effects, and of themselves would quickly pass away; but Mind and thought are one and inseparable, self-existent and ever active, the cause of all that appears.
An understanding of God, or universal Mind, is a key to all scriptures and occult writings. In the story of creation as told by Moses, which is metaphysically correct, all things were brought forth by "God said"--Mind thought.