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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