That virtue consists in conformity to reason, is true in some respects, and this faculty may very justly be considered, as in some sense, the source and principle of approbation and disapprobation, and of all solid judgments concerning right and wrong. It is by reason that we discover those general rules of justice by which we ought to regulate our actions: and it is by the same faculty that we form those more vague and indeterminate ideas of what is prudent, of what is decent, of what is generous or noble, which we carry constantly about with us, and according to which we endeavour, as well as we can, to model the tenour of our conduct. The general maxims of morality are formed, like all other general maxims, from experience and induction. We observe in a great variety of particular cases what pleases or displeases our moral faculties, what these approve or disapprove of, and, by induction from this experience, we establish those general rules. But induction is always regarded as one of the operations of reason. From reason, therefore, we are very properly said to derive all those general maxims and ideas. It is by these, however, that we regulate the greater part of our moral judgments, which would be extremely uncertain and precarious if they depended altogether upon what is liable to so many variations as immediate sentiment and feeling, which the different states of health and humour are capable of altering so essentially. As our most solid judgments, therefore, with regard to right and wrong, are regulated by maxims and ideas derived from an induction of reason, virtue may very properly be said to consist in a conformity to reason, and so far this faculty may be considered as the source and principle of approbation and disapprobation.