Page 76 (1-3).
Why are there two separate ideas קבלת עול מלכות שמים and קבלת עול מצוות.
There seems not to be a satisfactory answer in Niglah, so he says the Kabbalah answer.
It is Ratzoi, Mesiras Nefesh to Him, and Shuv, there is a world and vessels and there is a risk but it is the purpose to reveal Godliness in vessels.