Here's Peter Norvig's good old essay about the time and effort it takes to learn a craft. One of his points is to learn a lot of languages; here's a list of the ones I've dabbled in since 1977:
and I'm probably leaving some out. I'm not an expert in any of them, though I did write some very cool stuff in TeX and PostScript lo! these many years ago. I've found it takes some effort to switch from my current language to one of the older ones - like traveling to France with only your high-school French to get by on for a few days.
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A facility for quotation covers the absence of original thought.—Lord Peter Wimsey
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And the Word became flesh and dwelt among us.—St John of Patmos
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