“Another roof, another proof.”
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
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Paul Erdős 18
Hungarian mathematician and freelancer 1913–1996Related quotes

Ein scheinbarer Widerspruch gegen ein Naturgesetz ist nur die selten vorkommende Betätigung eines andern Naturgesetzes.
Source: Aphorisms (1880/1893), p. 36.

The Puff Pwns Gravity http://www.youtube.com/watch?v=YY4LZRBHtvc
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Letter Seven (14 May 1904)
Letters to a Young Poet (1934)
Variant: For one human being to love another human being: that is perhaps the most difficult task that has been given to us, the ultimate, the final problem and proof, the work for which all other work is merely preparation.
Source: The Selected Poetry of Rainer Maria Rilke
Context: People have (with the help of conventions) oriented all their solutions toward the easy and toward the easiest side of the easy; but it is clear that we must hold to what is difficult; everything alive holds to it, everything in Nature grows and defends itself in its own way and is characteristically and spontaneously itself, seeks at all costs to be so and against all opposition. We know little, but that we must hold to what is difficult is a certainty that will not forsake us; it is good to be solitary, for solitude is difficult; that something is difficult must be a reason the more for us to do it.
To love is good, too: love being difficult. For one human being to love another: that is perhaps the most difficult of all our tasks, the ultimate, the last test and proof, the work for which all other work is but preparation.

The Need for Transcendence in the Postmodern World (1994)
Context: An amalgamation of cultures is taking place. I see it as proof that something is happening, something is being born, that we are in a phase when one age is succeeding another, when everything is possible. Yes, everything is possible, because our civilization does not have its own unified style, its own spirit, its own aesthetic.