"There is a vast difference between the methods employed by the card conjurer in mystifying or amusing his audience; and those practiced at the card table by the professional, as in this case the entire conduct must be in perfrect harmony with the usual procedure of the game. The slightest action that appears irregular, the least effort to distract attention, or the first unnatural movement, will create suspicion; and mere suspicion will deplete the company, as no one but a simon-pure fool will knowingly play against more than ordinary chances. There is a way by which absolute protection against unknown advantages may be assured, that is by never playing for money."
- The Expert at the Card Table, S.W. Erdnase

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