Half of science is putting forth the right questions.

I don't believe art is available; it's rare and curious and should be completely isolated; one is more aware of its magic the more it is isolated.

Dreams, and predictions of astrology....ought to serve but for winter talk by the fireside.

Hope is the most beneficial of all the affections, and doth much to the prolongation of life.

[Science is] the labor and handicraft of the mind.

Nature is often hidden, sometimes overcome, seldom extinguished.

For what a man would like to be true, that he more readily believes.