Doctors always think anybody doing something they aren't is a quack; also they think all patients are idiots.
The man who sees absolutes, where all other men see nuances and shades of meaning, is either a prophet, or a quack.
If it looks like a duck, walks like a duck and quack like a duck, then it just may be a duck.
To practice magic is to be a quack; to know magic is to be a sage.
Penicillin sat on a shelf for ten years while I was called a quack.
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