...“But of you,” hecried, “base and vile rabble, I make no account; fling, strike, come on,do all ye can against me, ye shall see what the reward of your folly andinsolence will be... 
Miguel de Cervantes 「The History of Don Quixote, Vol. I, Complete」
...Besides which, you have been told that it is folly to take offence at merely hearing a bray...
Miguel de Cervantes 「The History of Don Quixote, Volume II., Complete」
...But for the fishers, I might have left my bones there, in pure folly...
Robert Louis Stevenson 「Kidnapped」
...I hope your lordship begins at last to perceive the folly of granting the King's commission to such a man as this against all my counsels...
Rafael Sabatini 「Captain Blood」
...But deeply though his rage was moved, it did not blind him to the folly of betraying it...
Rafael Sabatini 「Scaramouche」
... “That! Pooh! An incident; hardly a folly...
Rafael Sabatini 「Scaramouche」
...You willhear everything you regard as sacred laughed at and condemned, and every kindof nauseous folly acclaimed, and you must hold your tongue and pretend toagree...
John Buchan 「Mr. Standfast」
...It may comfort you to know that your folly may have made just thedifference between your country’s victory and defeat...
John Buchan 「Mr. Standfast」
... “Come,” she said to her companion, “we must not remain here any longer; I shall be committing some folly or other...
Alexandre Dumas, Pere 「Louise de la Valliere」
...The letter of farewell had been an added folly, pregnant with chances of disaster...
Anthony Hope 「Rupert of Hentzau」
...It is seldom of much use to show one who worships idols the folly of idolatry without giving something else as an object of adoration instead...
David Livingstone 「Missionary Travels and Researches in South Africa」
...This Kawawa, however, is not a good specimen of the Balonda chiefs, and is rather notorious in the neighborhood for his folly...
David Livingstone 「Missionary Travels and Researches in South Africa」
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