Source: http://lifebeforedeath.blogsome.com/quotes/
"Evolution is to the social sciences as statues are to birds: a  convenient platform upon which to deposit badly digested ideas." - Steve  Jones
"The word 'mundane' has come to mean 'boring' and 'dull', and it really  shouldn't - it should mean the opposite. Because it comes from the latin  
mundus, meaning 'the world'. And the world is anything but dull: The world is 
wonderful. There's real poetry in the real world. Science is the poetry of reality." - Richard Dawkins.
"Thankfully, there are scientists who do search for answers to the  question of the origin of the immune system. It's the immune system.  It's our defense against debilitating and fatal diseases. The scientists  who wrote those books and articles toil in obscurity, without book  royalties or speaking engagements. Their efforts help us combat and cure  serious medical conditions. By contrast, Professor Behe and the entire  intelligent design movement are doing nothing to advance scientific or  medical knowledge and are telling future generations of scientists,  don't bother." - From closing argument of attorney Eric Rothschild in  the 
Dover ID trial (check out the link, it's the Wikipedia article for Professor Behe, pretty interesting)
"Nothing in biology makes sense except in the light of evolution." - Theodosius Dobzhansky
"Well, evolution 
is a theory. It is also a fact. And facts and  theories are different things, not rungs in a hierarchy of increasing  certainty. Facts are the world's data. Theories are structures of ideas  that explain and interpret facts. Facts do not go away when scientists  debate rival theories to explain them. Einstein's theory of gravitation  replaced Newton's, but apples did not suspend themselves in mid-air,  pending the outcome. And humans evolved from apelike ancestors whether  they did so by Darwin's proposed mechanism or by some other, yet to be  discovered." - Stephen Jay Gould
"The universal opinion over thousands of years that the Earth was flat  never flattened its spherical shape by one inch." - Isaac Asimov.
"From the definition [of God] it follows that nothing is better than  God. Also, God must be better than me. Therefore, nothing is better than  me. So, I must be God. Now, I certainly exist. So, God must too.  Spotting the flaw is left as an excercise to the reader." - Daniel  Harbour
"I contend that we are both atheists. I just believe in one fewer god  than you do. When you understand why you dismiss all the other possible  gods, you will understand why I dismiss yours." - S. H. Roberts
"Arguing with a creationist is like playing chess with a pigeon. It'll  knock over the pieces, crap on the board, and fly back to it's flock to  claim victory." - Anonymous
"It is often said, mainly by the 'no-contests', that although there is  no positive evidence for the existence of God, nor is there evidence  against his existence. So it is best to keep an open mind and be  agnostic. At first sight that seems an unassailable position, at least  in the weak sense of Pascal's wager. But on second thoughts it seems a  cop-out, because the same could be said of Father Christmas and tooth  fairies. There may be fairies at the bottom of the garden. There is no  evidence for it, but you can't prove that there aren't any, so shouldn't  we be agnostic with respect to fairies?" - Richard Dawkins.
"Rational arguments don't usually work on religious people - otherwise there would be no religious people!" - Dr House
"It seems to me that the idea of a personal God is an anthropological  concept which I cannot take seriously. I also cannot imagine some will  or goal outside the human sphere. ... Science has been charged with  undermining morality, but the charge is unjust. A man's ethical behavior  should be based effectually on sympathy, education, and social ties and  needs; no religious basis is necessary. Man would indeed be in a poor  way if he had to be restrained by fear of punishment and hope of reward  after death." - Albert Einstein
"I do not believe in a personal God and I have never denied this but  have expressed it clearly. If something is in me which can be called  religious then it is the unbounded admiration for the structure of the  world so far as our science can reveal it." - Albert Einstein.
"The universe doesn't care what you 
believe. The wonderful thing about science is that it doesn't ask for your faith, it just asks for your eyes." - 
XKCD