Who said “Yet what are all such gaieties to me whose thoughts are full of indices and surds?”?

“What would life be without arithmetic, but a scene of horrors?”

“Stand firm in your refusal to remain conscious during algebra. In real life, I assure you, there is no such thing as algebra.”

“Mathematics may be defined as the subject in which we never know what we are talking about, nor whether what we are saying is true.”

“So-called professional mathematicians have, in their reliance on the relative incapacity of the rest of mankind, acquired for themselves a reputation for profundity very similar to the reputation for sanctity possessed by theologians.”

“Mathematics may be compared to a mill of exquisite workmanship, which grinds your stuff to any degree of fineness; but, nevertheless, what you get out depends on what you put in; and as the grandest mill in the world will not extract wheat flour from peas cods, so pages of formulae will not get a definite result out of loose data.”

“What I tell you three times is true.”

“Who in the world am I? Ah, that's the great puzzle.”

“The rule is, jam tomorrow and jam yesterday --but never jam today.”

“If you don't know where you are going, any road will get you there.”

“Sometimes I've believed as many as six possible things before breakfast.”

“I'm very brave generally, he went on in a low voice: only today I happen to have a headache.”