The principle of intervention, like that of healers, is first do no harm (primum non nocere); even more, we will argue, those who don’t take risks should never be involved in making decisions.

Primum non nocerum. (First do no harm)

First, do no harm.

In foreign policy, as in medicine, leaders must “first do no harm.”

The idea of is that nobody shd cause risk to others without impunity.

If you can do no good, at least do no harm.

The first principal of non-violent action is that of non-cooperation with everything humiliating.

The very first requirement in a hospital is that it should do the sick no harm.

NOT CAUSING HARM obviously includes not killing or robbing or lying to people. It also includes not being aggressive — not being aggressive with our actions, our speech, or our minds. Learning not to cause harm to ourselves or others is a basic Buddhist teaching on the healing power of nonaggression. Not harming ourselves or others in the beginning, not harming ourselves or others in the middle, and not harming ourselves or others in the end is the basis of enlightened society.

Don’t do what should not be done, and don’t desire what should not be desired. Abide by this one precept, and everything else will follow.

the first principle of all action is leisure.

There should be neither harming nor reciprocating harm.

It is the principle of necessity towards which, as to their ultimate centre, all the ideas advanced in this essay immediately converge. In abstract theory the limits of this necessity are determined solely by considerations of man’s proper nature as a human being; but in the application we have to regard, in addition, the individuality of man as he actually exists. This principle of necessity should, I think, prescribe the grand fundamental rule to which every effort to act on human beings and their manifold relations should be invariably conformed. For it is the only thing which conducts to certain and unquestionable results. The consideration of the useful, which might be opposed to it, does not admit of any true and unswerving decision.

Our prime purpose in this life is to help others. And if you can't help them, at least don't hurt them.