The following two paragraphs open the Idra Zuta, the study Rabbi Shimon gave the day he left the world.
I strongly suggest reading the Idra Zuta on any opportunity you have. When Rabbi Shimon revealed those secrets the heavens were open and when we study the Idra Zuta we tap into that energy of spiritual opening. It helps us with our (non-selfish) prayers.
Idra Zuta in PDF
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23) On the day that Rabbi Shimon intended to leave the world he was preparing himself (for the soul to ascend) and the friends gathered into his house. Before him were Rabbi Elazar (his son)
and Rabbi Aba (The scribe of the Zohar) and the rest of the friends, so the house was full (the Zohar said before the friends gathered and now the ‘rest’ of the friends because those are the three friends that left the world in the greater assembly).
Rabbi Shimon lifted his eyes and saw that the house was full. He wept and said, “In another time when I was sick Rabbi Pinchas ben Yair (Rabbi Shimon’s father in law) was with me and while I was choosing my place (above) my life was extended until this time. When I came back the fire was surrounding me and did not cease. Nobody could come to me without permission. Now I see that the fire stopped and the house is full.
(All great souls go up to heaven with fire. Usually, when the soul leaves the body the impure forces try to connect to the body and “suck” whatever energy is available. The fire protects the body and the soul gets a direct path to its “resting” place in the heavens. “Rest” is a spiritual state, not meaning “retired” from work. From the first time Rabbi Shimon was supposed to leave the world the fire was always present causing only people with permission to be able to come to him. This was for the protection of the people from below.
24) While they were sitting, Rabbi Shimon opened his eyes and saw what he saw and the fire returned to surround the house. (This time the house is full because the friends from the lower world had left, and the souls from heaven came down to honor and escort Rabbi Shimon on his ascend to the upper world.) Everyone left except for Rabbi Elazar, his son and Rabbi Aba. Rabbi Shimon said to Rabbi Elazar, his son, “go outside and look for Rabbi Yitzhak, that I was guarantor for him. Tell him to put his issues in order and come to my side, worthy is his place” (in heaven).