Partial Differential Quotes (2 quotes)
I did some very technical work in partial differential equations, made an unsuccessful pass at shock waves, worked in scale invariant variational problems, made a poor stab at three manifold topology, learned gauge field theory and then some about applications to four manifolds, and have recently been working in equations with algebraic infinite symmetries. I find that I am bored with anything I understand. My excuse is that I am too poor an expositor to want to spend time on formal matters.
In 'A Personal Profile of Karen K. Uhlenbeck', collected in Susan Ambrose et al., Journeys of Women in Science and Engineering, No Universal Constants (1999).
Laplace’s equation is the most famous and most universal of all partial differential equations. No other single equation has so many deep and diverse mathematical relationships and physical applications.
In G.F.D. Duff and D. Naylor (coauthors), Differential Equations of Applied Mathematics (1966), 133.
In science it often happens that scientists say, 'You know that's a really good argument; my position is mistaken,' and then they would actually change their minds and you never hear that old view from them again. They really do it. It doesn't happen as often as it should, because scientists are human and change is sometimes painful. But it happens every day. I cannot recall the last time something like that happened in politics or religion.
(1987) 
Carl Sagan
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