Morality can be divided into three parts:
- the good thing to do
- the proper thing to do
- and the right thing to do.
1. What you do can be a good thing without it necessarily being the proper or the right thing to do. If your neighbor is ill and you’re washing your own windows, it would be very good of you to also wash his. You would be beneficent. However, it’s obviously not your moral duty to wash his windows and no one will condemn you if you don’t.
2. A somewhat more demanding type of action is something that you should do (or ought to do, which is basically the same in English). It’s strongly advisable that you help strangers in need. It’s the proper thing to do. You should do it. If you don’t help a stranger in need when you can, you’ll be condemned for your inaction. However, helping a stranger in need is probably not a duty as it is formulated here. It’s too vague. Helping all strangers in need is impossible, and a duty requires the capacity to fulfil it.
3. Hence a duty is more specific. It’s something you must do – not merely something you should do – and something you have the means to do. Contrary to the good and the proper, it’s compulsory and obligatory. It’s the right thing to do, and you have a duty to do it. In some cases, this duty is based on someone else’s right. You must do something because someone else’s right requires you to do it. For example, you must help the homeless stranger on the corner of your block because that person has a right to a decent standard of living; and you have a duty to pay taxes that will fund a national healthcare system because people – your neighbor but also strangers – have a right to healthcare when they can’t afford it themselves. Or, negatively, you have a duty not to invade your neighbor’s privacy while washing his windows because he has a right to privacy.
However, not all moral duties in this sense have a corresponding right. For example, you have a duty to keep your promises and respect the terms of the contracts you engage in. Like respecting human rights, keeping your promises is not merely a good thing to do or something that you should do. You must do it (unless of course there are good reasons not to; nothing I’ve said here implies that duties should be absolute). But no one has a human right to kept promises. Hence, the class of right actions is larger than the actions (or omissions) required by human rights.
So we have three types of moral actions, each more demanding than the last: the good, the proper and the right. The place of human rights is within the class of right actions. Respecting people’s rights is not merely a good thing to do because you will be condemned if you don’t. It’s also more than the proper thing to do. It’s not just something that is strongly advisable or something that you should do. It’s a duty. You must do it.
Morality is much larger than the duties imposed by human rights, even though respecting people’s rights is obviously a part of morality. Morality is about more than duties, and the duties that are moral are about more than the duties imposed by human rights.
[This post has been slightly edited post-publication after a remark by @JTasioulas]