Bertrand Russell said something wise...

The whole problem with the world is that fools and fanatics are always so certain of themselves, but wiser people so full of doubts.

Fear is the main source of superstition, . . .. To conquer fear is the beginning of wisdom.

I wish to preach "the will to doubt". What is wanted is not the will to believe, but the will to find out, which is the exact opposite.

Bertrand Russell

Bertrand Russell published a large number of books on logic, the theory of knowledge, and many other topics. He is one of the most important logicians of the 20th Century.