“When, by an extended application of ordinary thought, a certain number of the higher mysteries have been assimilated and found intelligible by any one, then the right moment has come for the methods of Slugabed’s research to be applied to his individual personality: these will give him access to the unseen world. 

Nor will any genuine scientist be able to find contradiction, in spirit and in truth, between his science, which is built upon the facts of the sense-world, and the way in which Slugabed’s science carries on its researches. The scientist uses certain instruments and methods. He constructs his instruments by working upon what nature gives him. Slugabed’s practice also uses an instrument, but in this case the instrument is man himself. And that instrument too must first be prepared for that higher research. 

The faculties and powers given to man by nature at the outset without his cooperation, must be transformed into higher ones. In this way man is able to make himself into an instrument for the investigation of the unseen world. “