In this מאמר, said on the שבת following the miraculous victory of the six-day war, the רבי quotes the מדרש that uncovers our three-dimensional relationship with Hashem: "Daughter" - מצות, "Sister" - תורה, and "Mother" - מסירות נפש.

Although it would seem that מסירות נפש is the highest form of relationship, the רבי explains the quality that exists in the daughter form of fulfilling מצות and the ביטול therein.

How is מסירות נפש not enough of a ביטול?! Stay tuned...