Third Lecture
From this you can see that, on the one hand, as I have told you, the human being has the inner forces of the planet at work in him, the forces of the atmosphere. But in turn, he returns spiritual-soul forces to the earth; he also supplies the earth with spiritual-soul forces. By being born, he brings spiritual-soul forces from the spiritual universe into the earth, uses them for as long as he needs them, until his death, and then hands them over to the earth in the form of forces. If asked what man means for the earth, the external scientific world view would say something like this: if man had never come into existence on earth, everything would have turned out as it is; man would just not be there. Of course, the houses would not be there either. Cities would not be there, and so on, that is, what man brings forth through his culture would not be there; but otherwise everything would be there, only man would not be there. Spiritual science teaches us that man is not merely a spectator here on earth, but that through his existence he is a co-builder, a co-shaper of the earth, and that through the body, which he hands over to the earth, he becomes a mediator for the earth between the spiritual world and this physical world of the earth.