Take the humbug out of this world, and you haven't much left to do business with.
(about Dr. Po) Just another quack spouting psychobabble.
If it looks like a duck, quacks like a duck, it's a duck!
Nothing is more despicable than a professional talker who uses his words as a quack uses his remedies
Because Mathematicians frequently make use of Time, they ought to have a distinct idea of the meaning of that Word, otherwise they are Quacks.
I have never been converted to or even had much interest in spiritualism, occultism, Swedenborgianism or any particular religion. And I never, except occasionally for a laugh, visit the quacks who call themselves psychics.
A quick cure is a quack cure.
Let us leave the cure of public evils to those quacks, the statesmen.