“Give no poor fool the pretext to think ye are claiming knowledge of what no mortal knows.”

“Lord, what fools these mortals be!”

“What fools these mortals be. (Acheron)”

“Wisdom is the right use of knowledge. To know is not to be wise. Many men know a great deal, and are all the greater fools for it. There is no fool so great a fool as a knowing fool. But to know how to use knowledge is to have wisdom.”

“To know the history of science is to recognize the mortality of any claim to universal truth. ”

“I've thought that perhaps that's why women are so often sad, once the child's born," she said meditatively, as though thinking aloud. "Ye think of them while ye talk, and you have a knowledge of them as they are inside ye, the way you think they are. And then they're born, and they're different - not the way ye thought of them inside, at all. And ye love them, o' course, and get to know them they way they are...but still, there's the thought of the child ye once talked to in your heart, and that child is gone. So I think it's the grievin' for the child unborn that ye feel, even as ye hold the born one in your arms.”