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My Brain Is Open : The Mathematical Journeys of Paul Erdos (1998) by Bruce Schechter, p. 99

Paul Erdős - SF means Supreme Fascist http://www.youtube.com/watch?v=1qeWugmiGt4
Контексте: SF means Supreme Fascist — this would show that God is bad. I don't claim that this is correct, or that God exists, but it is just sort of half a joke. … As a joke I said, "What is the purpose of Life?" "Proof and conjecture, and keep the SF's score low."
Now, the game with the SF is defined as follows:
If you do something bad the SF gets at least two points.
If you don't do something good which you could have done, the SF gets at least one point.
And if nothing — if you are okay, then no one gets any point.
And the aim is to keep the SF's score low.

Paul Erdős - SF means Supreme Fascist http://www.youtube.com/watch?v=1qeWugmiGt4
Контексте: SF means Supreme Fascist — this would show that God is bad. I don't claim that this is correct, or that God exists, but it is just sort of half a joke. … As a joke I said, "What is the purpose of Life?" "Proof and conjecture, and keep the SF's score low."
Now, the game with the SF is defined as follows:
If you do something bad the SF gets at least two points.
If you don't do something good which you could have done, the SF gets at least one point.
And if nothing — if you are okay, then no one gets any point.
And the aim is to keep the SF's score low.

Though Erdős used this remark, it is said to have originated with his friend Stanisław Ulam, as reported in The Man Who Loved Only Numbers : The Story of Paul Erdős and the Search for Mathematical Truth (1998) by Paul Hoffman
Variants:
The first sign of senility is when a man forgets his theorems. The second sign is when he forgets to zip up. The third sign is when he forgets to zip down.
As quoted in Wonders of Numbers : Adventures in Mathematics, Mind, and Meaning (2002) by Clifford A. Pickover, p. 64
There are three signs of senility. The first sign is that a man forgets his theorems. The second sign is that he forgets to zip up. The third sign is that he forgets to zip down.
Misattributed

Referring to a famous statement by the French anarchist Pierre-Joseph Proudhon that "Property is theft!", as quoted in The Man Who Loved Only Numbers (1998) by Paul Hoffman, p. 7

Common remark when breaking off work for the night, as quoted in "The Magician of Budapest" in The Edge of the Universe : Celebrating Ten Years of Math Horizons (2007) by Deanna Haunsperger and Stephen Kennedy, p. 111

Widely attributed to Erdős, this actually originates with Alfréd Rényi, according to My Brain Is Open : The Mathematical Journeys of Paul Erdos (1998) by Bruce Schechter, p. 155
Misattributed
Вариант: A mathematician is a device for turning coffee into theorems.

Referencing Albert Einstein's famous remark that "God does not play dice with the universe", this is attributed to Erdős in "Mathematics : Homage to an Itinerant Master" by D. Mackenzie, in Science 275:759 (1997), but has also been stated to be a comment originating in a talk given by Carl Pomerance on the Erdős-Kac theorem, in San Diego in January 1997, a few months after Erdős's death. Confirmation of this by Pomerance is reported in a statement posted to the School of Engineering, Computer Science & Mathematics, University of Exeter http://empslocal.ex.ac.uk/people/staff/mrwatkin//kac-pomerance.txt, where he states it was a paraphrase of something he imagined Erdős and Mark Kac might have said, and presented in a slide-show, which subsequently became reported in a newspaper as a genuine quote of Erdős the next day. In his slide show he had them both reply to Einstein's assertion: "Maybe so, but something is going on with the primes."
Misattributed

His motto, as he roamed about the world, as the guest of other mathematicians, as quoted in A Tribute to Paul Erdős (1990) edited by Alan Baker, Béla Bollobás, A. Hajnal, Preface, p. ix

Response to a question by an agent of the US Immigration and Naturalization Service in 1954 as to what he thought of Karl Marx, often cited as an indication of his detachment from political sensibilities and the situations of the McCarthy era. He was afterwards denied a return visa for re-entering the US until 1959, after attending the International Congress of Mathematicians in Amsterdam; as quoted in The Man Who Loved Only Numbers : The Story of Paul Erdős and the Search for Mathematical Truth (1998) by Paul Hoffman, p. 128

A suggestion for his own epitaph, as quoted in Variety in Religion and Science: Daily Reflections (2005) by Varadaraja Raman, p. 256

As quoted in "Ramsey Theory" by Ronald L. Graham and Joel H. Spencer, in Scientific American (July 1990), p. 112-117

As quoted in Comic Sections : The Book of Mathematical Jokes, Humour, Wit, and Wisdom (1993) by Des MacHale

SF was an abbreviation for "Supreme Fascist" — the term Erdős often used to refer to God, as quoted in The Man Who Loved Only Numbers : The Story of Paul Erdős and the Search for Mathematical Truth (1998) by Paul Hoffman, p. 4

Frequent remark, as quoted in My Brain Is Open : The Mathematical Journeys of Paul Erdos (1998) by Bruce Schechter, p. 14

A standard greeting he would make when he was not contemplating some mathematical problem, as quoted in My Brain Is Open : The Mathematical Journeys of Paul Erdos (1998) by Bruce Schechter, p. 10

Said in regard to any particularly beautiful or elegant proof, referring to a mythical "book" in which God wrote the proofs for all theorems, as quoted in Philosophy of Mathematics (2008) by John Francis, p. 51