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Zeal, when it is a virtue, is a dangerous one

Meaning: According to this saying, "good zeal" cannot exist. It seems that zeal is inherently dangerous. When zeal is not a virtue, by definition it is not good. When zeal is a virtue, according to this saying it is dangerous, which is also not good. This saying relies heavily on paradox for its effect.

Note: zeal (noun) = enormous energy or enthusiasm for a cause or an objective | virtue (noun) = quality regarded as morally good in a person