username: “That would be true if Hashem (in a Midrash) had never told us the whole דירה בתחתונים thing. But obviously Hashem wanted us to know what Mitzvos accomplish, or He wouldn’t have told us.”
Maybe part of His test is to let us know why he gave us the mitzvos but for us to do them without taking His reason into account.
I would still like a source, especially a lubavicher source of a few generations ago, that says we should do mitzvos for His reason.
And regarding that (too) long piece of Tanya you quoted: assuming you got the “in short” right (sorry, but the quote is too long for me to go through online) I believe it’s exactly the same point the Chidusheir Horim was making, just in different words.