Lecture V

When in spirit you transport yourselves to those times of a primeval past, you must not imagine that had you been able to observe Saturn from somewhere in space you would have seen anything. Saturn had no light, it did not shine; only towards the end of its development did it begin to do so. Had you approached it in the middle of its evolution you would only have perceived its warmth, it was like an oven without external limits, but which limited itself: you would have entered an area of warmth.