He that uses his words loosely and unsteadily will either not be minded or not understood. - John Locke

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.

A sound mind in a sound body, is a short, but full description of a happy state in this world. He that has these two, has little more to wish for; and he that wants either of them, will be but little the better for anything else. Men’s happiness or misery is most part of their own making. He, whose mind directs not wisely, will never take the right way; and he, whose body is crazy and feeble, will never be able to advance in it.

Le leggi non vegliano sulla verità delle opinioni ma sulla sicurezza e l'integrità di ciascuno e dello Stato.