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The principles of ethics come from our own nature as social, reasoning beings.
--
Chapter 6, A New Understanding Of Ethics, p. 149

 

Peter Singer

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We know truth, not only by the reason, but also by the heart, and it is in this last way that we know first principles; and reason, which has no part in it, tries in vain to impugn them. The sceptics, who have only this for their object, labour to no purpose. We know that we do not dream, and however impossible it is for us to prove it by reason, this inability demonstrates only the weakness of our reason, but not, as they affirm, the uncertainty of all our knowledge. For the knowledge of first principles, as space, time, motion, number, is as sure as any of those which we get from reasoning. And reason must trust these intuitions of the heart, and must base them on every argument. (We have intuitive knowledge of the tri-dimensional nature of space, and of the infinity of number, and reason then shows that there are no two square numbers one of which is double of the other. Principles are intuited, propositions are inferred, all with certainty, though in different ways.) And it is as useless and absurd for reason to demand from the heart proofs of her first principles, before admitting them, as it would be for the heart to demand from reason an intuition of all demonstrated propositions before accepting them.
This inability ought, then, to serve only to humble reason, which would judge all, but not to impugn our certainty, as if only reason were capable of instructing us. Would to God, on the contrary, that we had never need of it, and that we knew everything by instinct and intuition! But nature has refused us this boon. On the contrary, she has given us but very little knowledge of this kind; and all the rest can be acquired only by reasoning.
Therefore, those to whom God has imparted religion by intuition are very fortunate, and justly convinced. But to those who do not have it, we can give it only by reasoning, waiting for God to give them spiritual insight, without which faith is only human, and useless for salvation.

 

Blaise Pascal

 

The word 'policy' generally refers to the principles that govern action directed towards given ends. Any study of policy therefore should concern itself with three things — what we want (the ends), how we get it (the means), and who are 'we,' that is, what is the nature of the organization or group concerned. Science is concerned with means rather than with ends. The study of "what we want" (objectives) extends beyond the boundaries of the social sciences into the field of ethics. It is not the business of the social sciences to evaluate the ultimate ends of human activity. The social sciences, therefore, cannot give a final answer to the question whether any given policy is right. The social scientist can study what people say they want, what they think they want and may even infer from their behaviour what they really want, but it is not the business of science to say whether people want right things.

 

Kenneth Boulding

 

I wish we could derive the rest of the phenomena of nature by the same kind of reasoning from mechanical principles; for I am induced by many reasons to suspect that they may all depend upon certain forces by which the particles of bodies, by some causes hitherto unknown, are either mutually impelled towards each other, and cohere in regular figures, or are repelled and recede from each other; which forces being unknown, philosophers have hitherto attempted the search of nature in vain; but I hope the principles here laid down will afford some light either to that or some truer method of philosophy.

 

Isaac Newton

 

Thus we seem to be on the verge of an expansion of welfare economics into something like a social science of ethics and politics: what was intended to be a mere porch to ethics is either the whole house or nothing at all. In so laying down its life welfare economics may be able to contribute some of its insights and analytical methods to a much broader evaluative analysis of the whole social process.

 

Kenneth Boulding

 

Land-use ethics are still governed wholly by economic self-interest, just as social ethics were a century ago.

 

Aldo Leopold