We shall principally endeavour to prove the latter point; the former being in a manner self-evident.
To begin, with vice and virtue; which are the most obvious causes of these passions; it would be entirely foreign to my present purpose to enter upon the controversy, which of late years has so much excited the curiosity of the publick.

WHETHER THESE MORAL DISTINCTIONS BE FOUNDED ON NATURAL AND ORIGINAL PRINCIPLES, OR ARISE FROM INTEREST AND EDUCATION.
The examination of this I reserve for the following book; and in the mean time I shall endeavour to show, that my system maintains its ground upon either of these hypotheses; which will be a strong proof of its solidity.
For granting that morality had no foundation in nature, it must still be allowed, that vice and virtue, either from self-interest or the prejudices of education, produce in us a real pain and pleasure; and this we may observe to be strenuously asserted by the defenders of that hypothesis.

Every passion, habit, or turn of character (say they) which has a tendency to our advantage or prejudice, gives a delight or uneasiness; and it is from thence the approbation or disapprobation arises.

We easily gain from the liberality of others, but are always in danger of losing by their avarice: Courage defends us, but cowardice lays us open to every attack: Justice is the support of society, but injustice, unless checked would quickly prove its ruin: Humility exalts; but pride mortifies us.

For these reasons the former qualities are esteemed virtues, and the latter regarded as vices.