The Rebbe taught this discourse on Shabbat Ki Tetze in 1985. The Sedra opens with the idea of a soldier in battle finding a beautiful woman, whom he takes captive, and the Torah regulates his behaviour. That is the usual interpretation. But the text seems to read as if the beautiful woman was already a captive in the hands of the enemy.   

The Chassidic perspective shows that the 'captive' is the material aspect of life.  It has been captured and made into something non-spiritual and non-holy. But the task of every individual man and woman is to redeem it and to reveal G-dliness in it.