§ 3.

The power which the proposed theory possesses of reducing the leading precepts of current morality to a scientific form, and of comprehending them, in company with sundry less acknowledged precepts, under one generalization, may also be quoted as additional evidence in its favour. Not as heretofore by considering whether, on the whole, manslaughter is productive of unhappiness, or otherwise—not by inquiring if theft is, or is not, expedient—not by asking in the case of slavery what are its effects on the common weal—not by any such complex and inexact processes, neither by the disputable decisions of unaided moral sense, are we here guided; but by undeniable inferences from a proved first principle. Nor are only the chief rules of right conduct and the just ordering of the connubial and parental relationships thus determined for us; this same first principle indirectly gives distinct answers respecting Edition: current; Page: [459] the proper constitution of governments, their duties, and the limits to their action. Out of an endless labyrinth of confused debate concerning the policy of these or those public measures, it opens short and easily-discerned ways; and the conclusions it leads to are enforced, both generally, by an abundant experience of the fallacy of expediency decisions, and specially, by numerous arguments bearing on each successive question. Underlying, therefore, as this first principle does, so wide a range of duty, and applied as it is by a process of mental admeasurement nearly related to the geometrical—namely, by ascertaining the equality or inequality of moral quantities (p. 110)—we may consider that a system of ethics synthetically developed from it, partakes of the character of an exact science; and as doing this possesses additional claims to our confidence.