Law of thought

Definition and stakes

T. Troward,  The Edinburgh Lectures on Mental Science

“ In actual practice we must first form the ideal conception of our object with the definite intention of impressing it upon the universal mind--it is this intention which takes such thought out of the region of mere casual fancies--and then affirm that our knowledge of the Law is sufficient reason for a calm expectation of a corresponding result, and that therefore all necessary conditions will come to us in due order. ”
Source: Gutenberg

St. George William Joseph Stock,  Deductive Logic

“ As an art logic may be called the navigation of the sea of thought.
§ 25. The laws of thought are all reducible to the three following axioms, which are known as The Three Fundamental Laws of Thought.
(1) The Law of Identity—
Whatever is, is;
or, in a more precise form,
Every A is A.
(2) The Law of Contradiction—
Nothing can both be and not be;
Nothing can be A and not A.
(3) The Law of Excluded Middle—
Everything must either be or not be;
Everything is either A or not A.
§ 26.
”
Source: Gutenberg

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