4387. WHAT THE INTELLECTUAL LIFE IS. That life is twofold, to wit, of the will and of the understanding, is manifest; but it was perceived, and instruction given to the same effect, that these two lives are as the sun and moon; the affection of good is the sun, the affection of truth, the moon; the light from voluntary things is of good, that from intellectual things is from the affection of truth. The intellectual life is of the affection of truth, but as the moon cannot shine without the sun, but derives from the sun the light which it reflects, so also with the intellectual life; if there is the affection of truth, then there is with it light from the Lord; but if the principles and persuasions by which a man is governed are of the false then he also has his sun, from which comes his intellectual light, to wit, from the love of self and the world; which sun is somewhat distant, but still excites [the intellectual] to shine; for nothing is learned without affection; the origin of affection is thence, that is to say, from its sun. Such is the intellectual life. - 1749, September 12.