But by far the most ingenious and at the same time most influential system of utilitarian morals is that which owes its distinctive feature to the doctrine of association of Hartley. This doctrine, which among the modern achievements of ethics occupies on the utilitarian side a position corresponding in importance to the doctrine of innate moral faculties as distinguished from innate moral ideas on the intuitive side, was not absolutely unknown to the ancients, though they never perceived either the extent to which it may be carried or the important consequences that might be deduced from it. Some traces of it may be found in Aristotle,(40) and some of the Epicureans applied it to friendship, maintaining that, although we first of all love our friend on account of the pleasure he can give us, we come soon to love him for his own sake, and apart from all considerations of utility.(41) Among moderns Locke has the merit of having devised the phrase, “association of ideas;”(42) but he applied it only to some cases of apparently eccentric sympathies or antipathies. Hutcheson, however, closely anticipated both the doctrine of Hartley and the favourite illustration of the school; observing that we desire some things as themselves pleasurable and others only as means to obtain pleasurable things, and that these latter, which he terms “secondary desires,” may become as powerful as the former. “Thus, as soon as we come to apprehend the use of wealth or power to gratify any of our original desires we must also desire them. Hence arises the universality of these desires of wealth and power, since they are the means of gratifying all our desires.”(43) The same principles were carried much farther by a clergyman named Gay in a short dissertation which is now almost forgotten, but to which Hartley ascribed the first suggestion of his theory,(44) and in which indeed the most valuable part of it is clearly laid down. Differing altogether from Hutcheson as to the existence of any innate moral sense or principle of benevolence in man, Gay admitted that the arguments of Hutcheson to prove that the adult man possesses a moral sense were irresistible, and he attempted to reconcile this fact with the teaching of Locke by the doctrine of “secondary desires.” He remarks that in our reasonings we do not always fall back upon first principles or axioms, but sometimes start from propositions which though not self-evident we know to be capable of proof. In the same way in justifying our actions we do not always appeal to the tendency to produce happiness which is their one ultimate justification, but content ourselves by showing that they produce some of the known “means to happiness.” These “means to happiness” being continually appealed to as justifying motives come insensibly to be regarded as ends, possessing an intrinsic value irrespective of their tendency; and in this manner it is that we love and admire virtue even when unconnected with our interests.(45)