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

We have to investigate the obstacles to the science of the spirit. If we do this, we shall discover why the following question is not considered: ‘How does the science of the spirit actually provide proof of supersensible insights?’ You see, the way I have described the path to you, spiritual scientific investigation provides proof firstly on the basis of serious scientific thinking, and then also by a route that is wholly in continuation of the modern scientific way. In spite of this, people will find all kinds of logical reasons that sound very good indeed when they first get to know spiritual scientific investigation of the kind we are speaking of here. Especially as a spiritual investigator, you often feel real respect for the reasons given by your opponents. These opponents are not considered the least bit silly by a spiritual investigator. Nor does one in the usual sense answer those attacks with any degree of fanaticism. We respect our opponents for we often find their reasons not silly but on the contrary, perfectly intelligent. On the other hand conventional scientists may again and again raise the objection against the spiritual investigation of which we are speaking that there simply are limits set to spiritual investigation.