Second Lecture

We must draw a practical conclusion from this. We must really draw the practical conclusion that we must not simply think in this way, that we can go terribly wrong if we think in this way. And among the many negative achievements that can be attributed to Kant, the positive one is that he once gave people a good rap on the knuckles with regard to this nonsense: thinking in this way, going at everything. If you think about it, you can prove that space must have a boundary somewhere, that the world is finite; but equally that it is infinite, because thought becomes unfounded as soon as you go beyond a certain sphere. And so Kant put together the so-called antinomies: how one can prove one thing just as well as the opposite, because thinking is unstable, has only a relative value. One can think quite correctly with regard to one point; but if one is not able to extend it to the other, which is perhaps next to it, one goes wrong if one simply thinks or even just observes at random. In this area, one can really see how little people are aware that one cannot just lash out, neither with thinking nor with observing and with some taking in of what is out there.