"The doctor sees all the weakness of mankind; the lawyer all the wickedness, the theologian all the stupidity " — Arthur Schopenhauer

Better to keep your mouth shut and appear stupid than to open it and remove all doubt

The man with a new idea is a crank until the idea succeeds

Any fool can critizise, condemn and complain – and most fools do

When a stupid man is doing something he is ashamed of, he always declares that it is his duty

A wise man gets more use from his enemies than a fool from his friends

Once harm has been done, even a fool understands it

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