No advantages in this world are pure and unmixed.

... superstitions, which, being unable to defend themselves on fair ground, raise these intangling brambles to cover and protect their weakness. Chased from the open country, these robbers fly into the forest, and lie in wait to break in upon every unguarded avenue of the mind, and overwhelm it with religious fears and prejudices. ... The idea of God, as meaning an infinitely intelligent, wise and good Being, arises from reflecting on the operations of our own mind, and augmenting, without limit, those qualities of goodness and wisdom.

Kitsch is: a species of beauty, which, as it is florid and superficial, pleases at first; but soon palls upon the taste, and is rejected with disdain, at least rated at much lower value.

No man ever threw away life while it was worth keeping.

What is easy and obvious is never valued; and even what is in itself difficult, if we come to knowledge of it without difficulty, and without and stretch of thought or judgment, is but little regarded.

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.

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.