B130 <=> B132 (BTG XVI Relative understanding time, p. 131)

“And so, my boy, when later, for reasons of which you will learn in the course of my further tales, they began to exist already excessively abnormally, that is to say, quite unbecomingly for three-brained beings, and when in consequence of this they had on the one hand ceased to emanate the vibrations required by Nature for the maintenance of the separated fragments of their planet, and, on the other hand, had begun, owing to the chief peculiarity of their strange psyche, to destroy beings of other forms of their planet, thereby gradually diminishing the number of sources required for this purpose, then Nature Herself was compelled gradually to actualize the presences of these three-brained beings according to the second principle, namely, the principle ‘Itoklanos,’ that is, to actualize them in the same way in which She actualize one-brained and two-brained beings in order that the equilibrium of the vibrations required according to quality and quantity should be attained.

“As regards the meaning of the principle ‘Itoklanos’ I shall also specially explain it to you sometime.

“And meanwhile remember, that although the fundamental motives for the diminution of the duration of the existence of the three-brained beings of this planet were from causes not depending on them, yet nevertheless, subsequently, the main grounds for all the said results were – and particularly now continue to be – the abnormal conditions of external ordinary being-existence established by them themselves. Owing to these conditions the duration of their existence has, down to the present time, continued to become shorter and shorter, and now is already diminished to such a degree that, at the present time, the difference between the duration of the process of the existence of the three-brained beings of other planets in the whole of the Universe and the duration of the process of the existence of the three-brained beings of the planet Earth has become the same as the difference between the real duration of their existence and the duration of the existence of the infinitesimal beings in that drop of water we took as an example.