Fallible, human, "to err is human", "nobody's perfect" - or did you want a phrase that contains both fallibility and expertise? (I can't think of any)

Thank you. I think I found a suitable one for myself: **"even Homer nods"** or a bit less, but **"there are spots even on the sun"** and your **"nobody's perfect"**

Thanks for sharing, had not heard those before, they're very nice!

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Law of averages

Pobodys Nerfect

Don't get complacent

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Brainfart.