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I must tell you something about the source of a mother's love for her child. It is because this child is made of her very own substance, and for quite a long time, relatively long, the material link, the link of substance, between mother and child is extremely close—it is as though a bit of her flesh had been taken out and put apart at a distance—and it is only much later that the tie between the two is completely cut. There is a kind of tie, of subtle sensation, such that the mother feels exactly what the child feels, as she would feel it in herself. That then is the material basis of the mother's attachment for the child. It is a basis of material identity, nothing else but that. Feeling comes much later (it may come earlier, that depends on people), but I am speaking of the majority: feeling comes only long afterwards, and it is conditioned. There are all kinds of things... I could speak to you for hours on the subject. But still this must not be mixed up with love. It is a material identification which makes the mother feel intimately, feel quite concretely and tangibly what the child is feeling: if the child receives a shock, well, the mother feels it. This lasts at least for two months. <ref>https://incarnateword.in/cwm/06/14-april-1954#p23</ref>

First of all, the effect of physical environment was recognised and studied long ago. It is by surrounding women with forms of art and beauty that, little by little, the ancient Greeks created the exceptionally harmonious race that they were.