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A Thaum is the basic unit of magical strength.  It has been universally
established as the amount of magic needed to create one small white pigeon
or three normal sized billiard balls.
		-- Terry Pratchett, "The Light Fantastic"

"A wizard cannot do everything; a fact most magicians are reticent to admit,
let alone discuss with prospective clients.  Still, the fact remains that 
there are certain objects, and people, that are, for one reason or another, 
completely immune to any direct magical spell.  It is for this group of
beings that the magician learns the subtleties of using indirect spells.
It also does no harm, in dealing with these matters, to carry a large club
near your person at all times."
		-- The Teachings of Ebenezum, Volume VIII

An ancient proverb summed it up: when a wizard is tired of looking for
broken glass in his dinner, it ran, he is tired of life.
		-- Terry Pratchett, "The Light Fantastic"

Chaos is King and Magic is loose in the world.

Do not meddle in the affairs of wizards, for they become soggy and hard to
light.

Do not throw cigarette butts in the urinal, for they are subtle and
quick to anger.

"Do not meddle in the affairs of wizards, for you are crunchy and good
with ketchup."

Do what thou wilt shall be the whole of the Law.
		-- Aleister Crowley

Eight was also the Number of Bel-Shamharoth, which was why a sensible wizard
would never mention the number if he could avoid it.  Or you'll be eight
alive, apprentices were jocularly warned.  Bel-Shamharoth was especially
attracted to dabblers in magic who, by being as it were beachcombers on the
shores of the unnatural, were already half-enmeshed in his nets.
Rincewind's room number in his hall of residence had been 7a.  He hadn't
been surprised.
		-- Terry Pratchett, "The Sending of Eight"

"How do you know she is a unicorn?" Molly demanded.  "And why were you afraid
to let her touch you?  I saw you.  You were afraid of her."
	"I doubt that I will feel like talking for very long," the cat
replied without rancor.  "I would not waste time in foolishness if I were 
you.  As to your first question, no cat out of its first fur can ever be
deceived by appearances.  Unlike human beings, who enjoy them.  As for your
second question --"  Here he faltered, and suddenly became very interested
in washing; nor would he speak until he had licked himself fluffy and then
licked himself smooth again.  Even then he would not look at Molly, but 
examined his claws.
	"If she had touched me," he said very softly, "I would have been
hers and not my own, not ever again."
		-- Peter S. Beagle, "The Last Unicorn"