"Restraint is important," said Pembrose. "You're smarter than to try something truly blatant, I know, but you're too clever by half. You'll think it can't hurt to try a little something, knowing everyone will assume it was prestidigitation. This you must not do. Always prepare a secret, a trick to explain it away."
"But why?" asked Cherie. "Why not actually use our power?"
Pembrose stroked his mustache. "Why can we do magic, apprentice?"
"We're wizards. Wise ones. We know the secrets."
"Wrong!" Pembrose snapped. "They believe even though they know it is not true. That is why the magic works."
Hammering Out an Effective Foil (Tomb Raider)
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