"Standards of morality and of justice are what Hume calls "artifacts"; they are neither divinely ordained, nor an integral part of original human nature, nor revealed by pure reason. They are an outcome of the practical experience of mankind, and the sole consideration in the slow test of time is the utility each moral rule can demonstrate toward promoting human welfare. Hume may be called a precursor to Darwin in the sphere of ethics. In effect, he proclaimed a doctrine of the survival of the fittest among human conventions—fittest not in terms of good teeth but in terms of maximum social utility."