371. There is a correspondence of the will with the heart, and of the intellect with the lungs. We propose to demonstrate this according to the following outline:

(1) All the constituents of the mind are connected with the will and intellect, and all the constituents of the body with the heart and lungs.

(2) There is a correspondence of the will and intellect with the heart and lungs, and consequently a correspondence of all the mind's constituents with all the body's constituents.

(3) The will corresponds to the heart.

(4) The intellect corresponds to the lungs.

(5) Through that correspondence one can discover many secrets relating to the will and intellect, and so also to love and wisdom.

(6) A person's mind is his spirit, and the spirit is the person, the body being the outward instrument by which the mind or spirit senses and acts in the physical world.

(7) The conjunction of a person's spirit with the body is due to the correspondence of his will and intellect with his heart and lungs, and their disjunction to the absence of that correspondence.