1. When the experts are agreed, the opposite opinion cannot be held to be certain.
2. When they are not agreed, no opinion can be regarded as certain by a non-expert.
3. When they all hold that no sufficient grounds for a positive opinion exist, the ordinary man would do well to suspend his judgment.
På vad sätt är detta inte vetenskaplig skepticism? I essän kallar han detta "rational skepticism", vilket i engelskspråkiga Wikipedia anges som en synonym till vetenskaplig skepticism.