“It is, of course, open to anyone to say that the whole idea is morbid and exaggerated--open even to those who think nothing of queuing for twenty-four hours in acute discomfort to see the first night of a musical comedy, which lasts three hours at most, which they are not sure of liking when they get there, and which they could see any other night with no trouble at all.”

“I looked for any footmarks of course, but naturally, with all this rain, there wasn't a sign. Of course, if this were a detective story, there'd have been a convenient shower exactly an hour before the crime and a beautiful set of marks which could only have come there between two and three in the morning, but this being real life in a London November, you might as well expect footprints in Niagara. I searched the roofs right along—and came to the jolly conclusion that any person in any blessed flat in the blessed row might have done it.”

“See that the mind is honest, first; the rest may follow or not as God wills. [That] the fundamental treason to the mind ... is the one fundamental treason which the scholar's mind must not allow is the bond uniting all the Oxford people in the last resort.”

“I say, I don’t think the human frame is very thoughtfully constructed for this sleuthhound business. If one could go on all fours, or had eyes in ones knees, it would be a lot more practical’… ‘What luck! Here’s a deep, damp ditch on the other side, which I shall now proceed to fall into.’ A slithering crash proclaimed that he had carried out his intention.”

“The only ethical principle which has made science possible is that the truth shall be told all the time. If we do not penalize false statements made in error, we open up the way for false statements by intention. And a false statement of fact, made deliberately, is the most serious crime a scientist can commit.”

“But suppose one doesn't quite know which one wants to put first. Suppose," said Harriet, falling back on words which were not her own, "suppose one is cursed with both a heart and a brain?""You can usually tell," said Miss de Vine, "by seeing what kind of mistakes you make. I'm quite sure that one never makes fundamental mistakes about the thing one really wants to do. Fundamental mistakes arise out of lack of genuine interest. In my opinion, that is.”

“[I]t's difficult to make people see that what you have been taught counts for nothing, and that the only things worth having are the things you find out for yourself. Also, that when so many brands of what Chesterton calls 'fancy souls' and theories of life are offered you, there is no sense in not looking pretty carefully to see what you are going in for. [...] It isn't a case of 'Here is the Christian religion, the one authoritative and respectable rule of life. Take it or leave it'. It's 'Here's a muddling kind of affair called Life, and here are nineteen or twenty different explanations of it, all supported by people whose opinions are not to be sneezed at. Among them is the Christian religion in which you happpen to have been brought up. Your friend so-and-so has been brought up in quite a different way of thinking; is a perfectly splendid person and thoroughly happy. What are you going to do about it?' -- I'm worrying it out quietly, and whatever I get hold of will be valuable, because I've got it for myself; but really, you know, the whole question is not as simple as it looks.”