Stoic advice: my career doesn’t impact the world, should I change it?

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C. writes: Currently, I am an academic. But before that, I had been in the industry for quite some time. (I suppose most people go the other way.) I have been reading Peter Singer intensively this year, starting with the book “How Are We to Live” recommended by you, followed by “The Life You Can Save,” “Animal Liberation,” etc.. Although Singer is a Utilitarian, not a