The principle appears simply in Pirkei Avot, the tractate of the Mishnah often translated as "Ethics of the Fathers." In the first chapter, Yehoshua ben Perachya offers three instructions: make for yourself a teacher, acquire for yourself a friend, and judge every person favorably — the Hebrew is closer to "on the scale of merit," as if judgment were a weighing rather than a verdict. The elaboration in the Talmud in tractate Shabbat (127b) shows how demanding the principle actually is.
The story there: a man works three years for an employer in a distant place, without receiving payment until the term ends. On the final day he asks for his wages. The employer says he has no money. The worker says nothing. No produce either. Still silent. No land. The worker takes his tools and walks home empty-handed. After the holiday, the employer arrives with the full payment and asks: when I said I had no money, what did you think? The worker answers: that perhaps your money was tied up in a purchase and couldn't be freed. When I said I had no produce? That perhaps it was leased to others. When I said I had no land? That perhaps it had been consecrated to the Temple. "That is exactly what happened," the employer replies. And the principle follows: just as you judged favorably, so may you be judged favorably.
The worker hasn't decided the employer is honest. He doesn't know. He chooses, deliberately, to hold open the possibility that a legitimate explanation exists — one he hasn't heard yet. This isn't naïvety. It's a specific act of imagination applied to another person: refusing to close on a verdict before the evidence warrants it, and in the meantime extending to someone else the interpretive charity that people extend to themselves automatically, without even noticing.
Seneca, in Letter 47, approaches the same problem from the other direction. His subject is Roman household slaves, and his indignation is partly moral, partly philosophical: "He is a slave: but perhaps free in spirit." The institution had done something specific to interpretation — it assigned a category, and the category then did the work of explanation. When a slave made a mistake, the explanation was the category: this is what slaves do, what they are. There was no question of what they might have been trying to accomplish, what complicated circumstance might account for it. The category exempted people from that inquiry entirely. "Remember," Seneca writes, "that he whom you call your slave sprang from the same stock, is smiled upon by the same skies, and on equal terms with yourself breathes, lives, and dies." The argument isn't only about decency. It's about what happens when a person is locked into a type before they've been looked at — the label does the interpreting, and the actual person never has to be understood.
What connects these traditions is their attention to the gap between categorizing and understanding. The quick verdict arrives feeling like realism — like clear sight unclouded by sentiment. But the Talmudic story suggests it's something else: a closing down, a refusal to construct the story that might make sense of what happened. The charitable interpretation is harder precisely because it requires building something rather than accepting the version that was already waiting. And it reveals an asymmetry worth sitting with: the full context of one's own behavior is always available from the inside — the pressures, the misread signals, the limited options. Others' failures arrive stripped of that context. They look clean and unambiguous, which is partly what makes confident verdicts about them feel so earned.
The worker goes home with empty hands, not knowing whether his interpretations were right. What he doesn't do is spend those miles deciding what kind of person his employer must be. That restraint — extending the imagination before closing the verdict — is what the tradition calls judging on the scale of merit. It's an active practice, not a passive one, and it costs something each time it's chosen.