(T)he opinion of experts, when it is unanimous, must be accepted by non-experts as more likely to be right than the opposite opinion. The scepticism that I advocate amounts only to this: (1) that when the experts are agreed, the opposite opinion cannot be held to be certain; (2) that when they are not agreed, no opinion can be regarded as certain by a non-expert; and (3) that when they all hold that no sufficient grounds for a positive opinion exist, the ordinary man would do well to suspend his judgment.
Bertrand Russell (1958). On the Value of Scepticism, in The Will to Doubt, p 39 (via Conversable Economist Timothy Taylor)
These propositions may seem mild, yet, if accepted, they would absolutely revolutionize human life.