Three rules of epistemology that should be taught at school: 1. Knowledge does not come from authority, but always from evidence, and evidence is very hard to get. The only tools to get evidence (including what it actually supports) are reason and scientific inquiry.
I am not advocating prescriptive moral relativism here (i.e. am not saying "you should not have values"). I am just pointing out that values are not a feature of reality itself, and you cannot understand others without being able to see the world through the lens of their values.
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