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 known that all things universally have relation to good and truth, and that there is not given a single entity in which there is not what has relation to those two. From this it is that in man there are two receptacles of life, one which is the receptacle of good, which is called the will, and another which is the receptacle of truth, which is called the understanding; and as good is of love, and truth is of wisdom, the will is the receptacle of love, and the understanding is the receptacle of wisdom. That good is of love, is because what a man loves, this he wills, and when he does it he calls it good; and that truth is of wisdom, is because all wisdom is from truths; yea, the good which a wise man thinks, is truth, and this becomes good when he wills it 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 a clear notion concerning them, vainly endeavors to know spiritual influx; for there is influx into the will, and there is influx into the understanding; there is an influx of the good of love into man's will, and there is an influx of the truth of wisdom into his understanding, both of them from Jehovah God immediately through the sun in the midst of which He is, and mediately through the angelic heaven. These two receptacles, the will and the understanding, are as distinct as heat and light; for 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, as was said above.  There is an influx from the human mind into the speech, and there is an influx into the actions; the influx into the speech is from the will through the understanding, but the influx into the actions is from the understanding through the will. They who know only of the influx into the understanding, and not at the same time into the will, and who reason and conclude from this, are like one-eyed persons, who see the objects on one side only, and not at the same time on the other; and like maimed persons, who do their work awkwardly with one hand only; and like the lame who hobble on one foot with a crutch. From these few things it is made plain, that spiritual heat flows into man's will, and produces the good of love, and that spiritual light flows into his understanding, and produces the truth of wisdom.