By far the best proof is experience.

Nature, to be commanded, must be obeyed.

Suspicions that the mind, of itself, gathers, are but buzzes; but suspicions that are artificially nourished and put into men's heads by the tales and whisperings of others, have stings.

The voice of the people has about it something divine: for how otherwise can so many heads agree together as one?

People prefer to believe what they want to be true.

Painting today is pure intuition and luck and taking advantage of what happens when you splash the stuff down.

Pyrrhus, when his friends congratulated to him his victory over the Romans under Fabricius, but with great slaughter of his own side, said to them, "Yes; but if we have such another victory, we are undone."