“But to me our equations are far more important, for politics are only a matter of present concern. A mathematical equation stands forever.”
Earliest source located is the book Brighter than a Thousand Suns: A Personal History of the Atomic Scientists by Robert Jungk (1958), p. 249, which says that Einstein made the comment during "a walk with Ernst Straus, a young mathematician acting as his scientific assistant at Princeton."
Variant: "Equations are more important to me, because politics is for the present, but an equation is something for eternity." From A Briefer History of Time by Stephen Hawking (2005), p. 144 http://books.google.com/books?id=4Y0ZBW19n_YC&lpg=PP1&pg=PA144#v=onepage&q&f=false.
Earlier, Straus recalled the German version of the quote in Helle Zeit, Dunkle Zeit: In Memoriam Albert Einstein (1956) edited by Carl Seelig<!-- Zurich: Europa Verlag -->, p. 71. There the quote was given as Ja, so muß man seine Zeit zwischen der Politik und unseren Gleichungen teilen. Aber unsere Gleichungen sind mir doch viel wichtiger; denn die Politik ist für die Gegenwart da, aber solch eine Gleichung is etwas für die Ewigkeit.
Attributed in posthumous publications
Context: Yes, we now have to divide up our time like that, between politics and our equations. But to me our equations are far more important, for politics are only a matter of present concern. A mathematical equation stands forever.
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Albert Einstein 702
German-born physicist and founder of the theory of relativi… 1879–1955Related quotes

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“all the standard equations of mathematical physics can be separated and solved in Kerr geometry.”
From Chandrasekhar's Nobel lecture, in his summary of his work on black holes; Republished in: D. G. Caldi, George D. Mostow (1989) Proceedings of the Gibbs Symposium: Yale University, May 15-17, 1989 p. 230

“Equations are just the boring part of mathematics. I attempt to see things in terms of geometry.”
As quoted in Stephen Hawking: A Biography (2005) by Kristine Larsen, p. 43
Source: Dragon's Egg (1980), Chapter 7, “Interaction” Section 6 (p. 255)