Who said “You know that the Tasmanians, who never committed adultery, are now extinct.”?

“A mistress should be like a little country retreat near the town, not to dwell in constantly, but only for a night and away.”

“It is not difficult to deceive the first time, for the deceived possesses no antibodies; unvaccinated by suspicion, she overlooks lateness, accepts absurd excuses, permits the flimsiest patching to repair great rents in the quotidian.”

“One man's folly is often another man's wife.”

“Adultery is the application of democracy to love.”

“Husbands are chiefly good lovers when they are betraying their wives.”

“Tradition is a guide and not a jailer.”

“It's very hard to be a gentleman and a writer.”

“The writer is more concerned to know than to judge.”

“Sentimentality is only sentiment that rubs you up the wrong way.”

“Anyone can tell the truth, but only very few of us can make epigrams.”

“Like all weak men he laid an exaggerated stress on not changing one's mind.”