Charles Darwin — "The greatest error of all is to stop at the first result."

"My mind seems to have become a kind of machine for grinding general laws out of large collections of facts."

"I am almost convinced (quite contrary to opinion I started with) that species are not (it is like confessing a murder) immutable."

"I have steadily endeavoured to keep my mind free so as to give up any hypothesis, however much beloved, as soon as facts are shown to be opposed to it."

"We are not to be discouraged by the smallness of the means, but to remember that the greatest results are often produced by the accumulation of small effects."

"If the misery of the poor be caused not by the laws of nature, but by our institutions, great is our sin."