Shmuel HaKattan says

Shmuel HaKattan says: "When your enemy falls be not glad, and when he stumbles let your heart not be joyous. Lest Hashem see and it displease Him, and He will turn His wrath from him [to you]" (Mishlei 24:17-18).

— from True North (Ethics, Integrity, Truth, Values) · Maharal of Prague Pirkel Avos: A Commentary based on selections from Maharal's Derech Chai

In the book

Good therapists teach a useful trick against this: step back far enough to see that your beliefs and perceptions are constructions of reality, not revelations of an absolute truth that can only be seen one way. The old wisdom even warns against the small ugliness of rejoicing when a rival falls — do not let your heart be glad when your enemy stumbles. Here is the deepest reason any of this matters: the moral life is not finally about you. — True North (Ethics, Integrity, Truth, Values)

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