Russell merits a great deal of attention. Consider the first chapter of his Skeptical Essays (1928), "On the Value of Scepticism."

His basic rule, the starting point which lays the foundation for all of these reflections:

...it is undesirable to believe a proposition when there is no ground whatever for supposing it true,

Russell expands this into three maxims:

The scepticism that I advocate amounts only to this:

(I) 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.

(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.

With his characteristic yet inimitable droll understatement, he adds,

These propositions may seem mild, yet, if accepted, they would absolutely revolutionize human life.