"Anyone who believes that exponential growth can go on forever in a finite world is either a madman or an economist". -Kenneth Ewart Boulding
"The whole problem with the world is that fools and fanatics are always so certain of themselves, but wiser people full of doubts" -Bertrand Russell
"No, markets weren't efficient at finding the truth; they were just very efficient at converging on a conclusion - often the wrong conclusion." Ben Horowitz, The Hard Thing about Hard Things on efficient markets hypothesis and how the market priced his business Opsware as going bankrupt despite having significant long term contracts.
"Every truth passes through three stages before its recognized. In the first its ridiculed, in the second its opposed;in the third its regarded as self evident." -Arthur Schopenhauer ( German philosopher 1788-1860)
"Markets look a lot less efficient from the banks of the Hudson than from the banks of Charles." -Fischer Black ( former MIT professor then GS)