4616. CONCERNING THE INTERACTION OF THE SOUL WITH THE BODY. ((Nothing can be known concerning the interaction of the soul, unless it is known what the soul is. It is impossible to speak of the interaction of something known, as is the body, with a thing entirely unknown as to all its quality. Who, at this day, knows anything as to what the soul is? Do not some regard it as a flaming something? some as an ethereal something? others a thinking something, [existing] in some such way as in a subject? others as a pure thinking something, without a substantial form by which [to exist]? What manner of opinion is held concerning the soul, is plainly manifest from this, that they assign it a seat in some part of the body: some in the heart, some in some part of the head, in the corpus striatum in the stomach, in the striated substance, yea, in the little pineal gland! Yea, indeed, from this it is plain, that, at this day, it is entirely unknown what the soul is, since [men] believe that, after death, it remains indeed, but is kept in a certain somewhere (Pu) till the judgment-day. If it should be asked whether it has any form, it is feared to reply thereto consequently, [they believe], also, that it has no quality.