"I cannot see the short, white curls Upon the forehead of an Ox, But what I see them dripping with That poor thing's blood, and hear the ax; When I see calves and lambs, I see Them led to death; I see no bird Or rabbit cross the open field But what a sudden shot is heard; A shout that tells me men aim true, For death or wound, doth chill me through."

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The scientist is a practical man and his are practical (i.e., practically attainable) aims. He does not seek the ultimate but the proximate. He does not speak of the last analysis but rather of the next approximation. His are not those beautiful structures so delicately designed that a single flaw may cause the collapse of the whole. The scientist builds slowly and with a gross but solid kind of masonry. If dissatisfied with any of his work, even if it be near the very foundations, he can replace that part without damage to the remainder.

— Gilbert N. Lewis