“The diameter divides into the circumference, you know. It ought to be three times. You'd think so, wouldn't you? But does it? No. Three point one four one and lots of other figures. There's no end to the buggers. Do you know how pissed off that makes me?"
—Terry Pratchett, Pyramids

[ozswede]

If equations are trains threading the landscape of numbers, then no train stops at pi.
— Richard Preston

[ozswede]

If pi wasn’t around, there would be no round pies!
— Paul J. Nahin

[ozswede]

It can be of no practical use to know that Pi is irrational, but if we can know, it surely would be intolerable not to know.
— Edward Charles Titchmarsh

[ozswede]

What good your beautiful proof on [the transcendence of] π? Why investigate such problems, given that irrational numbers do not even exist?
— Leopold Kronecker

[DaveLDaveL]

A short, broad man of tremendous vitality, the physical type of Hereward, the last of the English, and his brother-in-arms, Winter, Sylvester’s capacious head was ever lost in the highest cloud-lands of pure mathematics. Often in the dead of night he would get his favorite pupil, that he might communicate the very last product of his creative thought. Everything he saw suggested to him something new in the higher algebra. This transmutation of everything into new mathematics was a revelation to those who knew him intimately. They began to do it themselves. His ease and fertility of invention proved a constant encouragement, while his contempt for provincial stupidities, such as the American hieroglyphics for π and e, which have even found their way into Webster’s Dictionary, made each young worker apply to himself the strictest tests.
— George B. Halsted

[DaveLDaveL]

De Morgan was explaining to an actuary what was the chance that a certain proportion of some group of people would at the end of a given time be alive; and quoted the actuarial formula, involving p [pi], which, in answer to a question, he explained stood for the ratio of the circumference of a circle to its diameter. His acquaintance, who had so far listened to the explanation with interest, interrupted him and exclaimed, “My dear friend, that must be a delusion, what can a circle have to do with the number of people alive at a given time?”
— W.W.R. Ball

[accountant1usa]

The roundest knight at King Arthur’s table was Sir Cumference. He ate too much pi. - anonymous

Sorry No anonymous quotes are allowed in this contest - HogwartsExpress

[DaveLDaveL]

The Biblical value of pi, by comparison, is exactly three, as is clear from a verse in 1 Kings vii 23: 'and he made a molten sea, ten cubits from brim to brim, and his height was five cubit; and a line of thirty cubits did encompass him round about.'
— Eli Maor

[DaveLDaveL]

This mysterious 3.141592…, which comes in at every door and window, and down every chimney, calling itself the circumference to a unit of diameter.
— Augustus De Morgan

[lush]

Today scientists recognize the Comma of Pythagoras, Pi and the Golden Proportion as well as the closely related Fibonacci sequence are universal constants that describe complex patterns in astronomy, music and physics. ...

To the Egyptians these numbers were also the secret harmonies of the cosmos and they incorporated them as rhythms and proportions in the construction of their pyramids and temples.”
― Jonathan Black, Mark Booth

[hija]

Once when lecturing to a class he [Lord Kelvin] used the word “mathematician,” and then interrupting himself asked his class: “Do you know what a mathematician is?” Stepping to the blackboard he wrote upon it:— [an integral expression equal to the square root of pi]
Then putting his finger on what he had written, he turned to his class and said: “A mathematician is one to whom that is as obvious as that twice two makes four is to you. Liouville was a mathematician.”

— Silvanus Phillips Thompson,
In Life of Lord Kelvin (1910), 1139.

[lush]

“Euler’s Formula encapsulates the whole of existence. It contains 0, the number of the monad (ontological zero); the number e that determines exponentiation; the number i that determines the imaginary domain (time); the number 1 that determines the domain of counting numbers (and with 0 creates the binary system of computing), and real numbers (space); -1, the number of the negative domain (antimatter); and the number π that determines the world of the circle and geometry. Euler’s Formula is the unquestionable God Equation.”
― Mike Hockney, The God Equation

[lush]

“If we look at our traditional tales, where the action before the final success always occurs three times: the last of the three times is always a little longer because it includes success: life is somehow the famous 0.142592653589793 after three....These stories are a kind of mythical Pi, that we finally 'mathematified', quantified by numbers. That's why the number Pi was and is so important. It explains the inexplicable, life, eternity, infinity, and at the same time the cycle of rebirth.”
― Marie Cachet

[hija]

"The soul may not be destroyed. The soul goes on forever. Like the number pi, it is without cessation or conclusion. Like pi it is a constant. Pi is an irrational number, incapable of being made into a fraction, impossible to divide from itself. So, too, the soul is an irrational, indivisible equation that perfectly expresses one thing: you."
— Joe Hill