Inevitably our opinions cover a bigger space, a longer reach of time, a greater number of things, than we can directly observe. They have, therefore, to be pieced together out of what others have reported and what we can imagine.

It is often very illuminating...to ask yourself how you got at the facts on which you base your opinion. Who actually saw, heard, felt, counted, named the thing, about which you have an opinion?

The facts we see depend on where we are placed and the habits of our eyes.

Happiness cannot be the reward of virtue; it must be the intelligible consequence of it.

Men who are orthodox when they are young are in danger of being middle-aged all their lives.

The self-evident truth which makes men invincible is that inalienably they are inviolable persons.

In a place where everybody thinks alike, nobody thinks very much.