The Doctrine of Evolution is the greatest discovery ever made by the human mind. We are in the act of understanding it now, and hence are not able to… - J. Howard Moore

The satisfaction of the much stigmatized <nowiki>''</nowiki>animal propensities," or <nowiki>''</nowiki>carnal desires," whatever they are, may be just as exemplary and noble as the satisfaction of the desire for knowledge or opulence; and they are, in fact, frequently more so. The only rational characterization of a low desire is one incapable of yielding to the universe in its satisfaction large returns of happiness. And a high desire is simply one affording to the universe in its satisfaction wide and profound welfare. The only reason why any desire, so-called "high" or so-called <nowiki>''</nowiki>low," should be kept in abeyance is that its satisfaction will not contribute to the utilities. There is no reason why any desire capable of satisfaction possessed by a living being should not be satisfied, except that its satisfaction may interfere with the satisfaction of other more valuable desires possessed by the being himself or by other beings.

In their phenomena of life the inhabitants of the earth display endless variety. They swim in the waters, soar in the skies, squeeze among the rocks, clamber among the trees, scamper over the plains, and glide among the grounds and grasses. Some are born for a summer, some for a century, and some flutter their little lives out in a day. They are black, white, blue, golden, all the colours of the spectrum. Some are wise and some are simple; some are large and some are microscopic; some live in castles and some in bluebells; some roam over continents and seas, and some doze their little day-dream away on a single dancing leaf. But they are all the children of a commion mother and the co-tenants of a common world. Why they are here in this world rather than some place else; why the world in which they find themselves is so full of the undesirable; and whether it would not have been better if the ball on which they ride and riot had been in the beginning sterilised, are problems too deep and baffling for the most of them. But since they are here, and since they are too proud or too superstitious to die, and are surrounded by such cold and wolfish immensities, what would seem more proper than for them to be kind to each other, and helpful, and dwell together as loving and forbearing members of One Great Family?

The trouble with all ethical systems of this world has been their partiality. They have been arranged with undue regard for those who invented them. And this defect vitiates the prevailing systems to-day as it has vitiated the systems that have been produced in times gone by.