V. Can a method of gaining insight into spheres beyond the sense-perceptible world be given a scientific basis?

We have seen why there have to be limits. It is because human beings need to be capable of love and memory. Just as we alternate between waking and sleeping in life, and the one cannot exist without the other, so spiritual investigation may take its place beside natural science, beside a life that needs to have the capacity for memory and love. The reason is that firstly, spiritual investigation makes no claim on anything that can be recalled—the day after tomorrow, when we will be talking about spiritual scientific psychology, we shall see what the situation truly is with regard to memory. The discoveries made in spiritual scientific research are the only thing the human soul is able to live in without a claim being made on something that otherwise is so essential in life—the power to remember. On the other hand we have to say with regard to the capacity for love that we increase our power of love by entering more deeply into the element which otherwise rises from the subconscious rather like antipathy, and that spiritual investigation therefore does not destroy the capacity for love but rather increases it. Just as waking and sleeping can exist side by side to maintain human health, so spiritual science may take its place by the side of natural science, for the reasons I have given. In spite of this, natural scientists or people who believe in gaining their popular view of the world on the basis of natural science will always point out, as clear proof, why there have to be those limits to natural scientific insight.