...I have been unable to ascertain the motive for the good, or account for the callousness of conscience with which they perpetrate the bad...
David Livingstone 「Missionary Travels and Researches in South Africa」
...As reasoning beings, it is our duty to heed the lessons of history,and not rush blindly on until we perpetrate a continent destitute ofwild life...
William T. Hornaday 「Our Vanishing Wild Life」
...Less timid, however, than they, should the outdoor yield be small, she will sometimes come indoors to perpetrate her villainies...
J. Henri Fabre Alexander Teixeira de Mattos 「The Life of the Fly」
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