417. Now as love corresponds to the heart, and the understanding to the lungs, the foregoing statements may be corroborated by their correspondence; as, for instance, how the understanding can be elevated above its own love even into wisdom; and how, if that love is merely natural, the understanding is drawn down by it from that elevation. Man has a twofold respiration; one of the body, the other of the spirit. These two respirations may be separated and they may be conjoined; with men merely natural, especially with hypocrites, they are separated, but rarely with men who are spiritual and sincere. Consequently a merely natural man and hypocrite, whose understanding has been elevated, and in whose memory therefore various things of wisdom remain, can talk wisely in company by thought from the memory; but when not in company, he does not think from the memory, but from his spirit, thus from his love. He also respires in like manner, inasmuch as thought and respiration act correspondently. That the structure of the lungs is such that they can respire both by blood from the heart and by blood from outside of the heart has been shown above.