Shabbath Shalom

King David, also the embodiment of malchut (royalty), experienced this level of selflessness as well. Thus he is described as "leaping and dancing before G-d" (with an abandon that embarrassed his wife Michal, daugher of Saul). Like Sarah, he was able to maintain selflessness even in the midst of self-manifestation. For when one experiences the ultimate level of selflessness, there is no room for corruption even when joy is made manifest.
It is with the power of our past, the joy of Sarah and King David, that we are capable of experiencing the joy that will lead to the ultimate joy, when "they will come to Zion in song, eternal joy upon their heads…" (Isaiah 35:10)

[Adapted from Sefer Hamaamarim 5679 p. 87; Sefer Hamaamarim Melukat 2:145]