Selection from New Jerusalem and Its Heavenly Doctrine ~ Emanuel Swedenborg
THE WILL AND THE UNDERSTANDING
Man has two faculties which make his life; one is called the Will, and the other the Understanding. These faculties are distinct from each other, but are so created that they may be one; and when they are one they are called the Mind. Of these, then, the human mind consists; and the whole life of man is there.As all things in the universe, which are according to Divine order, have relation to good and truth, so all things with man have relation to the will and the understanding; for good with man is of his will, and truth with him is of his understanding; for these two faculties, or these two lives of man, are their receptacles and subjects. The will is the receptacle and subject of all things of good, and the understanding the receptacle and subject of all things of truth. Goods and truths with man are nowhere else; and because goods and truths with man are nowhere else, so neither are love and faith elsewhere; for love is of good, and good is of love; and faith is of truth, and truth is of faith.
Since, then, all things in the universe have relation to good and truth, and all things of the church to the good of love and the truth of faith; and since man is man from those two faculties, therefore they also are treated of in this doctrine; otherwise man could have no distinct idea of them, on which to found his thought.
The will and the understanding also constitute the spirit of man; for his wisdom and intelligence, and his life in general, reside in them; the body is only obedience.
Nothing is more important to know than how the will and the understanding make one mind. They make one mind as good and truth make one; for there is a similar marriage between the will and the understanding as there is between good and truth. What is the quality of that marriage may fully appear from what has been quoted above, concerning good and truth, namely, as good is the very esse of a thing, and truth the existere of a thing thence derived, so the will with man is the very esse of his life, and the understanding the existere of life thence; for good, which is of the will, forms and renders itself visible in the understanding.
They who are in good and truth have will and understanding, but they who are in evil and in falsity have not will and understanding; but instead of will they have cupidity, and instead of understanding they have science. For the truly human will is the receptacle of good, and the understanding is the receptacle of truth; for which reason will cannot be predicated of evil, nor can understanding be predicated of falsity, because they are opposites, and opposites destroy each other. Hence it is, that the man who is in evil and thence in falsity, cannot be called rational, wise, and intelligent.
With the evil, also, the interiors of the mind, in which the will and the understanding principally reside, are closed. It is believed that the evil also have will and understanding, because they say that they will, and that they understand; but their willing is only cupidity, and their understanding is only knowing.
(New Jerusalem and Its Heavenly Doctrine 28-34)