Medical men do not know the drugs they use, nor their prices.

If I sit and daydream, the images rush by like a succession of colored slides.

The general root of superstition is that men observe when things hit, and not when they miss, and commit to memory the one, and pass over the other.

Men suppose their reason has command over their words; still it happens that words in return exercise authority on reason

I feel that I am much freer if I'm on my own, but I'm sure that there are a lot of painters who would perhaps be even more inventive if they had people round them... I find that if I am on my own I can allow the paint to dictate to me. So the images that I'm putting down on the canvas dictate the thing to me and it gradually builds up and comes along.

All bravery stands upon comparisons.

It is the true office of history to represent the events themselves, together with the counsels, and to leave the observations and conclusions thereupon to the liberty and faculty of every man's judgment