With reference to the interests of society, there are two distinct assertions to be made. The first is, that although the pursuit of the welfare of others is undoubtedly one form of virtue, it does not include all virtue, or, in other words, that there are forms of virtue which, even if beneficial to mankind, do not become virtuous on that account, but have an intrinsic excellence which is not proportioned to or dependent on their utility. The second is, that there may occasionally arise considerations of extreme and overwhelming utility that may justify a sacrifice of these virtues. This sacrifice may be made in various ways—as, when a man undertakes an enterprise which is in itself perfectly innocent, but which in addition to its great material advantages will, as he well knows, produce a certain measure of crime; or when, abstaining from a protest, he tacitly countenances beliefs which he considers untrue, because he regards them as transcendently useful; or again, when, for the benefit of others, and under circumstances of great urgency, he utters a direct falsehood, as, for example, when by such means alone he can save the life of an innocent man.(131) But the fact, that in these cases considerations of extreme utility are suffered to override considerations of morality, is in no degree inconsistent with the facts, that the latter differ in kind from the former, that they are of a higher nature, and that they may supply adequate and legitimate motives of action not only distinct from, but even in opposition to utility. Gold and silver are different metals. Gold is more valuable than silver; yet a very small quantity of gold may be advantageously exchanged for a very large quantity of silver.