Sixth Lecture
If the earth has its own power only in this one inside it (it is drawn), then that is just a small earth. The sun has retreated, now this small earth is alone with the large earth. When the sun comes again, what should it do now with what has become mere earth? In reality, the sun must be able to reach in again – there is no difference here, whether the sun goes around the earth or the earth around the sun – the sun, when it is in a new relationship to the earth, must be able to reach in. You can imagine it in the following way: Imagine a person standing firmly in one place and using all his strength to remain standing. You approach from the side and try to push him over. If he has enough strength within him to stand, you will not be able to move him. But when it begins to move, you will be able to intervene in its direction of movement. Suppose there were a force inside it that would cause the orbiting movement of the sun, or of the earth itself, like an inner momentum; let us assume that the sun would communicate this momentum to the small earth: then the sun could in turn intervene in this movement that it has imparted. In this way, it could snatch this small Earth from the Earth, and the process could take place as described. In other words, towards spring we would have a small Earth in which the Sun intervenes through impulses of motion that it had already imparted the previous fall. The Sun intervenes, snatches the small Earth from the mere forces of the Earth, and, in accordance with the effect of the Sun, unfolds on a larger scale that which is limited only to the small Earth. The forces must contract, and the small globe of the earth must be given the momentum of the sun. You already suspect what it is: I have described in sketchy terms what happens during the growth of plants, the unfolding of plants into leaves, flowers and fruits. I have described to you here the participation of the sun's momentum: that is fertilization; the seed is fertilized and remains so until the following year, when it is again seized by the sun. The little grain that carries out the fertilization in the plant is the being in which, through the sun's maturation, the possibility is laid to convey this momentum to the earthly part.
Cite:
GA 174b/1915-11-24/p009 · edition English