Memory is the power to revive again in our minds those ideas which after imprinting have disappeared, or have been laid aside out of sight.

What worries you, masters you.

I am sure, zeal or love for truth can never permit falsehood to be used in the defense of it.

The first step to get this noble and manly steadiness, is... carefully keep children from frights of all kinds, when they are young. ...Instances of such who in a weak timorous mind, have borne, all their whole lives through, the effects of a fright when they were young, are every where to be seen, and therefore as much as may be to be prevented.

Every man carries about him a touchstone, if he will make use of it, to distinguish substantial gold from superficial glitterings, truth from appearances. And indeed the use and benefit of this touchstone, which is natural reason, is spoiled and lost only by assuming prejudices, overweening presumption, and narrowing our minds.

If by gaining knowledge we destroy our health, we labour for a thing that will be useless in our hands.

Things of this world are in so constant a flux, that nothing remains long in the same state.