As man advances in civilisation, and small tribes are united into larger communities, the simplest reason would tell each individual that he ought to extend his social instincts and sympathies to all the members of the same nation, though personally unknown to him. This point being once reached, there is only an artificial barrier to prevent his sympathies extending to the men of all nations and races. If, indeed, such men are separated from him by great differences in appearance or habits, experience unfortunately shews us how long it is before we look at them as our fellow-creatures. Sympathy beyond the confines of man, that is humanity to the lower animals, seems to be one of the latest moral acquisitions. It is apparently unfelt by savages, except towards their pets. How little the old Romans knew of it is shewn by their abhorrent gladiatorial exhibitions. The very idea of humanity, as far as I could observe, was new to most of the Gauchos of the Pampas. This virtue, one of the noblest with which man is endowed, seems to arise incidentally from our sympathies becoming more tender and more widely diffused, until they are extended to all sentient beings. As soon as this virtue is honoured and practised by some few men, it spreads through instruction and example to the young, and eventually through public opinion.

A man who has made a tolerable progress in humanity, will adopt, and ever bear in mind, the principle of increasing, as far as lies within his power, the quantity of pleasure in the world, and diminishing that of pain: he will establish this to himself as a constant and inviolable rule of action, and in carrying it into practice he will not overlook one created thing that is endowed with faculties capable of perceiving pleasure and pain. He will reflect on who it was that gave these faculties and remember that they were not given to be sported with. He will not esteem the meanest of animals beneath the notice of his humanity because, in the meanest of them, the wisdom and power of the all-benevolent Being are displayed. This is the Being without whom not a single sparrow shall fall to the ground and whose bounty feeds the young ravens that call upon him. His sensibility will be tremblingly alive to the sensations of all animated nature, and he will feel for everything that is capable of feeling: he will look upon pity, kindness, and mercy toward his own species as the weightier matters of humanity, but at the same time, he will consider the humane treatment of animals as more than the tithe of the anise and cummin of it. He will scrupulously do his duty in the former, and in the latter, he will not leave it undone.

Few people seem to perceive fully as yet that the most far-reaching consequence of the establishment of the common origin of all species is ethical; that it logically involved a readjustment of altruistic morals, by enlarging, as a necessity of rightness, the application of what has been called the 'Golden Rule' from the area of mere mankind to that of the whole animal kingdom. Possibly Darwin himself did not quite perceive it. While man was deemed to be a creation apart from all other creations, a secondary or tertiary morality was considered good enough to practise towards the 'inferior' races; but no person who reasons nowadays can escape the trying conclusion that this is not maintainable. And though we may not at present see how the principle of equal justice all round is to be carried out in it entirety, I recognize that the League is grappling with the question.

Some may find these conclusions frightening, and perhaps that's an appropriate reaction. But then again, maybe it’s not. For it is certainly possible to frame an ethic consistent with the Darwinian view of the world. Such an ethic might emphasize the virtue of being honest enough and courageous enough to acknowledge unflinchingly that there is probably no God, no afterlife, and no soul; that there is no objective basis to morality or higher purpose behind our suffering; that we are insignificant in a vast and impersonal cosmos; that existence is ultimately without purpose or meaning; and that the effects of our actions will ultimately fade away without trace. It is admirable to acknowledge these uncongenial truths, yet to struggle on as if life were meaningful and strive to make the world a better place anyway, without promise of eternal reward or hope of ultimate victory, and indeed for no good reason at all.

A central truth of the Darwinian philosophy is the unity and consanguinity of all organic life. And during the next century or two the ethical corollary of this truth is going to receive unprecedented recognition in all departments of human thought.

there is a basic ethical attitude: respect for life, respect for other humans, certainly, but for all forms of life. It’s something that if everyone could just realize how special it is to be alive on this little blue speck in the universe, it’s a miracle that life exists at all and that we have a piece of time that is ours — whoever we are, shorter or longer, whatever it is, but — to really be a part of the action and to respect where we have come from, where we might be going.

Sir, I am fully sensible of the greatness of that freedom, which I take with you on the present occasion; a liberty which seemed to me scarcely allowable, when I reflected on that distinguished and dignified station in which you stand, and the almost general prejudice and prepossession, which is so prevalent in the world against those of my complexion. I suppose it is a truth too well attested to you, to need a proof here, that we are a race of beings, who have long labored under the abuse and censure of the world; that we have long been looked upon with an eye of contempt; and that we have long been considered rather as brutish than human, and scarcely capable of mental endowments. Sir, I hope I may safely admit, in consequence of that report which hath reached me, that you are a man far less inflexible in sentiments of this nature, than many others; that you are measurably friendly, and well disposed towards us; and that you are willing and ready to lend your aid and assistance to our relief, from those many distresses, and numerous calamities, to which we are reduced. Now Sir, if this is founded in truth, I apprehend you will embrace every opportunity, to eradicate that train of absurd and false ideas and opinions, which so generally prevails with respect to us ; and that your sentiments are concurrent with mine, which are, that one universal Father hath given being to us all ; and that he hath not only made us all of one flesh, but that he hath also, without partiality, afforded us all the same sensations and endowed us all with the same faculties ; and that however variable we may be in society or religion, however diversified in situation or color, we are all of the same family, and stand in the same relation to him. Sir, if these are sentiments of which you are fully persuaded, I hope you cannot but acknowledge, that it is the indispensible duty of those, who maintain for themselves the rights of human nature, and who possess the obligations of Christianity, to extend their power and influence to the relief of every part of the human race, from whatever burden or oppression they may unjustly labor under ; and this, I apprehend, a full conviction of the truth and obligation of these principles should lead all to.

Sympathy beyond the confines of man, that is humanity to the lower animals, seems to be one of the latest moral acquisitions. It is apparently unfelt by savages, except towards their pets. How little the old Romans knew of it is shewn by their abhorrent gladiatorial exhibitions. The very idea of humanity, as far as I could observe, was new to most of the Gauchos of the Pampas. This virtue, one of the noblest with which man is endowed, seems to arise incidentally from our sympathies becoming more tender and more widely diffused, until they are extended to all sentient beings.

There is a saying that an injustice to one is an injustice to all. No one is truly equal and free until everyone is equal and free. When a society allows anyone to be treated as less than equal and therefore less than fully human, we not only rob those people of their full humanity, we also become complicit in their mistreatment. Sometimes people think they can look the other way as long as “their group” isn’t harmed. But that is an illusion because we are all connected by our humanity, and as history has proven over and over again, harsh and autocratic power will inevitably spread like cancer to maintain itself…

Non-violence leads to the highest ethics, which is the goal of all evolution. Until we stop harming all other living beings, we are still savages.

The idea of universal human dignity ultimately comes out of Christianity... the view that all human beings are equal in the sight of God because they have the capacity for moral choice. As Western thought developed in the 17th-18th centuries, this took on a secular form under thinkers like Jean-Jacques Rousseau or Immanuel Kant or Georg Hegel, who argued that human equality is... based on human autonomy.

Man is but a single sector in the great circle of sentient life. The human species is one among a million or two of species inhabiting the earth. The beings below and around us have had the same origin as we have. They have the same general architecture of both body and mind, and are footballed by the same antithetical impulses of pleasure and pain. Whatever the beings of this world have been in the past, they can never again be anything but a family. Universal ethics is a corollary of universal kinship. Moral obligation is as boundless as feeling.