3886. But be it known that the variations in the heavens in respect to pulsations and respirations are manifold, being as many as are the societies; for they are according to the states of thought and affection with the angels; and these are according to their states of faith and love; but the general pulsation and respiration are as above described. Once also it was given me to observe the cardiac pulsation of those who were of the province of the hinder part of the head, and to note one by one the pulsations of the celestial and those of the spiritual in that province. The pulsations of the celestial were tacit and gentle; but those of the spiritual were strong and vibratory. The intervals of the pulsation of the spiritual were to those of the celestial as five to two; for the pulsation of the celestial inflows into that of the spiritual, and thus goes forth and passes into nature. And wonderful to say the speech of the celestial angels is not heard by the spiritual angels, but is perceived under the form of a pulsation of the heart; and this because the speech of the celestial angels is not intelligible to the spiritual angels, for it is produced by affections which are of love; whereas that of the spiritual is produced by intellectual ideas (see n. 1647, 1759, 2157, 3343); and the former belong to the province of the heart, but the latter to the province of the lungs.