BOTH THAT HEAT AND THAT LIGHT FLOW INTO MAN: THE HEAT INTO HIS WILL, WHERE IT PRODUCES THE GOOD OF LOVE; AND THE LIGHT INTO HIS UNDERSTANDING, WHERE IT PRODUCES THE TRUTH OF WISDOM.
It is well known that all things universally have relation to good and truth, and that there is not a single thing in existence in which there is not something related to those two. On this account there are two receptacles of life in man: one, which is the receptacle of good, called the will; and another, which is the receptacle of truth, called the understanding; and, as good is of love and truth is of wisdom, the will is the receptacle of love, and the understanding the receptacle of wisdom. Good is of love, because what a man loves that he wills, and when he brings it into action he calls it good: and truth is of wisdom, because all wisdom is from truths; indeed, the good which a wise man thinks is truth, which becomes good when he wills and does it.
 He who does not rightly distinguish between these two receptacles of life, which are the will and the understanding, and does not form for himself a clear notion respecting them, strives in vain to comprehend the nature of spiritual influx. For there is influx into the will, and there is influx into the understanding. Into the will of man there is an influx of the good of love, and into his understanding there is an influx of the truth of wisdom, each proceeding from Jehovah God, directly through the sun in the midst of which He is, and indirectly through the angelic heaven. These two receptacles, the will and the understanding, are as distinct as heat and light; for, as was said above, the will receives the heat of heaven, which in its essence is love, and the understanding receives the light of heaven, which in its essence is wisdom.
 There is an influx from the human mind into the speech, and there is an influx into the actions; the influx into speech is from the will through the understanding, but the influx into the actions is from the understanding through the will. Those who are only acquainted with the influx into the understanding, and not at the same time with that into the will, and who reason and conclude therefrom, are like one-eyed persons, who only see the objects on one side of them, and not at the same time those on the other; and like maimed persons, who do their work awkwardly with one hand only; and like lame persons, who walk by hopping on one foot, with the assistance of a staff. From these few observations it is plain that spiritual heat flows into the will of man, and produces the good of love, and that spiritual light flows into his understanding, and produces the truth of wisdom.