We find in the course of nature that though the effects be many, the principles from which they arise are commonly few and simple, and that it is the sign of an unskilled naturalist to have recourse to a different quality in order to explain every different operation.

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.

What a peculiar privilege has this little agitation of the brain which we call 'thought'.

The bigotry of theologians is a malady which seems almost incurable.

In all matters of opinion and science ... the difference between men is ... oftener found to lie in generals than in particulars; and to be less in reality than in appearance. An explication of the terms commonly ends the controversy, and the disputants are surprised to find that they had been quarrelling, while at bottom they agreed in their judgement.

The great charm of poetry consists in lively pictures of the sublime passions, magnanimity, courage, disdain of fortune; or thoseof the tender affections, love and friendship; which warm the heart, and diffuse over it similar sentiments and emotions.

A CAUSE is an object precedent and contiguous to another, and so united with it that the idea of the one determines the mind to form the idea of the other, and the impression of the one to form a more lively idea of the other.