The reason that angels fly is that they take themselves so lightly.

In the struggle for existence, it is only on those who hang on for ten minutes after all is hopeless, that hope begins to dawn.

The Church is a house with a hundred gates: and no two men enter at exactly the same angle

The modern habit of saying "This is my opinion, but I may be wrong" is entirely irrational. If I say that it may be wrong, I say that is not my opinion. The modern habit of saying "Every man has a different philosophy; this is my philosophy and it suits me" – the habit of saying this is mere weak-mindedness. A cosmic philosophy is not constructed to fit a man; a cosmic philosophy is constructed to fit a cosmos. A man can no more possess a private religion than he can possess a private sun and moon.

In dealing with the arrogant asserter of doubt, it is not the right method to tell him to stop doubting. It is rather the right method to tell him to go on doubting, to doubt a little more, to doubt every day newer and wilder things in the universe, until at last, by some strange enlightenment, he may begin to doubt himself.

If the world grows to worldly, it can be rebuked by the Church; but if the Church grows to worldly, it cannot be adequately rebuked for worldlyness by the world.

The great intellectual tradition that comes down to us from the past was never interrupted or lost through such trifles as the sack of Rome, the triumph of Attila, or all the barbarian invasions of the Dark Ages. It was lost after the introduction of printing, the discovery of America, the founding of the Royal Society, and all the enlightenment of the Renaissance and the modern world. It was there, if anywhere, that there was lost or impatiently snapped the long thin delicate thread that had descended from distant antiquity; the thread of that unusual human hobby: the habit of thinking.