We continue to describe the love of Hashem taking place during Davening and specifically during שמע.

While "בכל לבבך" definitely deals head-on with the enemy, "בכל נפשך" is not either a true expression of peace, being that the enemy still exists, albeit subdued.

True peace, as defined by the non-existence of the enemy, only happens in the world of "בכל מאדך", the world of יחידה, as it is nothing but an expression of Hashem, a reality in which nothing else exists.

This is experienced (at this point of the מאמר) through true מסירות נפש, when a איד gives it all away not because he chooses to, but because of a non-choice reality - the reality of the יחידה!