(8) The third conjunction is through affection for seeing truth, from which springs thought.  That affection for knowing is one thing, affection for understanding another, and affection for seeing truth another, or that affection for truth is one thing, perception of truth another, and thought another, is seen but obscurely by those who cannot perceive the operations of the mind as distinct, but is seen clearly by those who can.  This is obscurely seen by those who do not perceive the operations of the mind as distinct, because with those who are in affection for truth and in perception of truth, these operations are simultaneous in the thought, and when simultaneous they cannot be distinguished.  Man is in manifest thought when his spirit thinks in the body, which is especially the case when he is in company with others; but when he is in affection for understanding, and through that comes into perception of truth, he is then in the thought of his spirit, which is meditation.  This passes, indeed, into the thought of the body, but into silent thought; for it is above bodily thought, and looks upon what belongs to thought from the memory as below itself, drawing therefrom either conclusions or confirmations.  But real affection for truth is perceived only as a pressure of will from something pleasurable which is interiorly in meditation as its life, and is little noticed.  From all this it can now be seen that these three, affection for truth, perception of truth, and thought, follow in order from love, and that they have existence only in the understanding.  For when love enters into the understanding, which it does when their conjunction is accomplished, it first brings forth affection for truth, then affection for understanding that which it knows, and lastly, affection for seeing in the bodily thought that which it understands; for thought is nothing but internal sight.  It is true that thought is the first to be manifest, because it is of the natural mind; but thought from perception of truth which is from affection for truth is the last to be manifest; this thought is the thought of wisdom, but the other is thought from the memory through the sight of the natural mind.  All operations of love or the will not within the understanding have relation not to affections for truth, but to affections for good.

405.  That these three from the will’s love follow in order in the understanding can, indeed, be comprehended by the rational man but yet cannot be clearly seen and thus so proved as to command belief.  But as love that is of the will acts as one with the heart by correspondence, and wisdom that is of the understanding acts as one with the lungs (as has been shown above) therefore what has been said (in n. 404) about affection for truth, perception of truth, and thought, can nowhere be more clearly seen and proved than in the lungs and the mechanism thereof.  These, therefore, shall be briefly described.  After birth, the heart discharges the blood from its