We are told about the great joy on each Shabbat eve when the Tree of Life is awakened and produces sanctified souls. When the Shabbat arrives the souls come down to rest on a Holy Nation and the souls of the righteous ascend to the higher Garden of Eden. When the Shabbat ends those additional souls that dwelt upon the children of Yisrael rise above and the souls of the just descend. The souls that rose stand in the presence of God who queries them about what new things in the Torah they learned in the world. When a soul says a new interpretation God gathers His entourage and tells them about it in both Yeshivot.