Error (n.) when great and carried out methodically with universal applause can always be traced to the philosophy reigning at the time.
Error (n.) that is clearly worked out still has value, since it is at least formally correct; a book that is merely vague has none at all.
Error (n.) when clearly thought out is at least formally correct and worth something; a work that is objectively tedious is at all times without value.
Error (n.) removed is not something taken from a man but something given him — for knowing that something is wrong is itself a truth; and no error is harmless.
Error (n.) should be welcomed when it is finally proclaimed loudly and openly: its falseness will soon be felt just as loudly — it is as if an abscess had burst.
Error (n.) is always an inference from effect to cause that silently assumes "always" where it should say "sometimes": if there is no money in my safe, my servant must have a key.
Error (n.) may reign a thousand years, yoke whole nations, and chain by its slaves and dupes those it cannot deceive; there is no harmless error, for every error has poison at its heart.