B1219 <=> B1221 (BTG XLVIII From the Author, p. 1220)

In order that you should have at least an approximate understanding of this strange organ with its properties, and also of the manifestations in ourselves of the consequences of these properties, we must dwell a little longer upon this question and speak about it in somewhat greater detail.

Great Nature, in Her foresight and for many important reasons (about which theoretical explanations will be given in later lectures), was constrained to place within the common presences of our remote ancestors just such an organ, thanks to the engendering properties of which they might be protected from the possibility of seeing and feeling anything as it proceeds in reality.

Although this organ was later “removed” also by Great Nature from their common presences, yet owing to a cosmic law expressed by the words “the assimilation of the results of oft-repeated acts” – according to which law, from the frequent repetition of one and the same act there arises in every “world concentration” under certain conditions a predisposition to produce similar results – this law-conformable pre-disposition which arose in our forefathers was transmitted by heredity from generation to generation, so that when their descendants in the process of their ordinary existence established numerous conditions which proved to be congenial for the said law-conformableness, from that time on the consequences of the various properties of this organ arose in them, and being assimilated owing to transmission by heredity from generation to generation, they ultimately acquired almost the same manifestations as those of their ancestors.