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If the energy of zeal is not counterbalanced by thought, then it is not zeal but a kind of mental derangement.
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.