Sutor, ne ultra crepidam is by far my favorite Latin expression. It means "Shoemaker, not beyond the shoe."
Apparently, a Greek cobbler criticised the rendering of a shoe in a painting by the Greek artist Apelles of Kos. Apelles followed the cobbler's advice and repainted the shoe only to hear the cobbler extend his criticism into disparagement of sections of the painting having nothing to do with shoes. Consequently, Apelles told him to stick to his area of expertise when delivering subjective verdicts: Sutor ne ultra crepidam!
We are all the judgmental shoemaker to some extent. In fact, I probably spend more time criticising non-shoe subjects than I do making shoes. I spend all day looking at my equivalent of shoes. I'm bored of them so let me get my teeth into my equivalent of umbrellas, pince-nez, snowboards, and knee-high socks.
Fortunately for me, there is a trend nowadays to believe experts in one particular area of expertise are oracles of wisdom on every other possible area of expertise also. Scientists expound upon Economics; Geologists expound upon Gender Equality; Astrophysicists expound upon Agriculture; Cobblers expound upon Painting; and so on. At times it seems like experts expound upon absolutely everything except their own area of expertise.
This entire blog has been and continues to be a record of a cobbler avoiding the subject of shoes in order to wax lyricallyish about everything else under the sun.
Perhaps he should look down once in a while to make sure the sole isn't flapping off his own shoe. But I doubt he will.