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The pursuit of pretty formulas and neat theorems can no doubt quickly degenerate into a silly vice, but so can the quest for austere generalities which are so very general indeed that they are incapable of application to any particular.

追求漂亮的公式和简洁的定理无疑会很快堕落为愚蠢的恶习，但追求严格的普遍性也会很快堕落为愚蠢的恶习，因为严格的普遍性是如此普遍，以至于它们无法适用于任何特定的情况。

— Eric Temple Bell 埃里克·坦普尔·贝尔