What worries you masters you. - John Locke

When by these steps he has got resolution enough not to be deterr'd from what he ought to do, by the apprehension of danger; when fear does not, in sudden or hazardous occurrences, decompose his mind, set his body a-trembling, and make him unfit for action, or run away from it, he has then the courage of a rational creature: and such an hardiness we should endeavour by custom and use to bring children to, as proper occasions come in our way.

Reason must be our last judge and guide in everything.

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.