(7) Bernard Lievegoed brings us closer to the subject of incorporation when he talks about the Bodhisattva in his book entitled About the Salvation of the Soul, published posthumously:

A bodhisattva does not incarnate as a human being but works from the spiritual world into certain human individualities. In spiritual science these are called "incorporations." The human individualities that are chosen by a bodhisattva must, of course, have reached a degree of spiritual maturity to make such an incorporation possible.

In his Karlruhe lecture of 14 October 1911, Steiner clarifies what is referred to as incorporation by the spiritual science:

Occult research confirms that no one during his childhood and youth gives so little sign of what he really is as he who is to incorporate a Bodhisattva. For at a certain point of time in his life a great change comes over him. If an individuality from the remote past Moses, for example is incorporated, it is not the same with him as it was with the Christ individuality, to whom Jesus of Nazareth left the sheaths. In the case of a Bodhisattva there certainly will be something like an exchange, but the individuality remains in a certain sense, and the individuality who comes from the remote past as patriarch or another and is to bring new forces for the evolution of humanity, descends, and the human being who receives him experiences an immense transformation. This transformation occurs particularly between the thirtieth and thirty-third years. It can never be known beforehand that this body will be taken possession of by the Bodhisattva. The change never shows itself in youth. The distinctive feature is precisely that the later years are so unlike the youthful ones.