Let us assume, for the sake of argument, that learning Clojure is not the only worthwhile pursuit in life. Let us also disregard worthwhile pursuits other than programming.
Clojure is not meant to be an isolated island. Rich Hickey has made that case better than I can.
In addition to Clojure, what other two programming languages are worth learning to complement Clojure? I am especially interested in the reasoning why. Are you looking back on your experience, finding that you’re so happy you learned language/ecosystem X before coming to Clojure? Or is your hindsight telling you that you should have learned something else? Please explain.
In answers, I’m accepting both “You should learn Java because of Maven’s vast value”, or “I’m not mentioning Java because you’ll have to learn a bit of Java regardless”. I’m more interested in the rationale than the choice.