375. The correspondence of the will and understanding with the heart and lungs cannot be proved abstractly, that is, by reasonings alone, but may be proved by effects. It is the same as with the causes of things. These, indeed, can be seen rationally, but only clearly, by effects; for causes are in effects, and by their means render themselves visible; till then the mind is not convinced about causes. The effects of such correspondence will be related in what follows. But lest anyone fall into ideas concerning this correspondence acquired from hypotheses about the soul, let him first read carefully what has been shown in the preceding section; (n. 363-364), Love and wisdom, and will and understanding therefrom, make the very life of man; (n. 365), The life of man is in first things in the brains, and in its derivatives in the body; (n. 366), Such as life is in first things, such it is in the whole and its every part; (n. 367), By means of those first things life is in the whole from every part, and in every part from the whole; (n. 368), Such as the love is, such is the wisdom, and therefore such is the man.