Euler's Beautiful Equation

"Gentlemen, that is surely true, it is absolutely paradoxical; we cannot understand it, and we don't know what it means. But we have proved it, and therefore we know it must be the truth." —Benjamin Pierce, a Harvard mathematician, after proving Euler's equation, e^iπ = –1, in a 19th-century lecture.

http://blog.sciencenews.org/mathtrek/2007/04/eulers_beautiful_equation.html