Though the managing ourselves well in this part of our behavior has the name good-breeding, as if a peculiar effect of education; yet... young childr… - John Locke

For if it be asked what security, what fence is there in such a state against the violence and oppression of this absolute ruler, the very question can scarce be borne. They are ready to tell you that it deserves death only to ask after safety. Betwixt subject and subject, they will grant, there must be measures, laws, and judges for their mutual peace and security. But as for the ruler, he ought to be absolute, and is above all such circumstances; because he has a power to do more hurt and wrong, it is right when he does it. To ask how you may be guarded from or injury on that side, where the strongest hand is to do it, is presently the voice of faction and rebellion. As if when men, quitting the state of Nature, entered into society, they agreed that all of them but one should be under the restraint of laws; but that he should still retain all the liberty of the state of Nature, increased with power, and made licentious by impunity. This is to think that men are so foolish that they take care to avoid what mischiefs may be done them by polecats or foxes, but are content, nay, think it safety, to be devoured by lions.

I am sure the principal end why we are to get knowledge here, is to make use of it for the benefit of ourselves and others in this world; but if by gaining it we destroy our health, we labour for a thing that will be useless in our hands, and if by harnessing our bodies (though with a design to render ourselves more useful) we deprive ourselves of the abilities and opportunities of doing that good we might have done with a meaner talent, which God thought sufficient for us by having denied us the strength to improve it to that pitch which men of higher constitutions can attain to, we rob God of so much service, and our neighbor of all that help, which, in a state of health, with moderate knowledge, we might have been able to perform. He that sinks his vessel by overloading it, though it be with gold and silver and precious stones, will gives his owner but an ill account of his voyage.

though this can scarce happen amongst that part of mankind that have consented to the use of money.