3321. Concerning which matter, it was afterwards granted to think, of which [I have treated] previously here and there, I think, amongst my observations concerning the lungs; yea, know what [is] the falling of [letting out] the respiration and what its drawing in, and also what its natural [principle] and what its voluntary: that the natural rules at [by] night, and the mixed voluntary by day; also that [when] in the womb there is no respiration, but that as soon as the senses and muscles have [need] to operate the respiration [begins]. It was also said to spirits that they are unacquainted with the ordering of the respiration, and that, men do not care to know; which is most diverse in its action; how it operates into the muscles is directed [intenditur] remitted [and] determined; also in each thing of speech, which are cost secret to man; [and this] also because scarce anyone attends or reflects thereupon, not even knowing that there is given a natural and voluntary respiration; that it is variously mixed in wakefulness, according to the directings [intentiones] and qualities of the sensations and acts of the body. Hence it follows that there is an internal respiration when it is granted to man to speak with spirits, which is regulated by the Lord alone, the angels also being ignorant [of the mode] [thereof].