The sense of justice and injustice is not deriv'd from nature, but arises artificially... from education, and human conventions. - David Hume

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.

To begin with clear and self-evident principles, to advance by timorous and sure steps, to review frequently our conclusions, and examine accurately all their consequences; though by these means we shall make both a slow and a short progress in our systems; are the only methods, by which we can ever hope to reach truth, and attain a proper stability and certainty in our determinations.

One that has well digested his knowledge both of books and men, has little enjoyment but in the company of a few select companions. He feels too sensibly, how much all the rest of mankind fall short of the notions which he has entertained. And, his affections being thus confined within a narrow circle, no wonder he carries them further than if they were more general and undistinguished. The gaiety and frolic of a bottle companion improves with him into a solid friendship; and the ardours of a youthful appetite become an elegant passion.