“All that belongs to human understanding, in this deep ignoranceand obscurity, is to be sceptical, or at least cautious, and notto admit of any hypothesis whatever, much less of any which issupported by no appearance of probability.”

“We must therefore glean up our experiments in this science from a cautious observation of human life, and take them as they appear in the common course of the world, by men’s behaviour in company, in affairs, and in their pleasures. Where experiments of this kind are judiciously collected and compared, we may hope to establish on them a science, which will not be inferior in certainty, and will be much superior in utility to any other of human comprehension.”

“There are some great mysteries here, which each of us is better placed to understand than any sceptical scientist or religious zealot, simply because our Universe is not the same as theirs.”

“Understanding human nature must be the basis of any real improvement in human life. Science has done wonders in mastering the laws of the physical world, but our own nature is much less understood, as yet, than the nature of stars and electrons. When science learns to understand human nature, it will be able to bring a happiness into our lives which machines and the physical sciences have failed to create.”

“There is no simple explanation for anything important any of us do, and the human tragedy, or the human irony, consists in the necessity of living with the consequences of actions performed under the pressure of compulsions so obscure we do not and cannot understand them.”

“The deepest, the only theme of human history, compared to which all others are of subordinate importance, is the conflict of scepticism with faith.”