It is harder to avoid censure than to gain applause.

Interest is the barometer of the state.

Apart from the representational content of an idea there is another component: its force and vivacity, its impetus.

It seems to me, that the only Objects of the abstract Sciences or of Demonstration is Quantity and Number, and that all Attempts to extend this more perfect Species of Knowledge beyond these Bounds are mere Sophistry and Illusion.

In ancient times, bodily strength and dexterity, being of greater use and importance in war, was also much more esteemed and valued, than at present. ... In short, the different ranks of men are, in a great measure, regulated by riches.

While we are reasoning concerning life, life is gone.

While Newton seemed to draw off the veil from some of the mysteries of nature, he showed at the same time the imperfections of the mechanical philosophy; and thereby restored her ultimate secrets to that obscurity, in which they ever did and ever will remain.