When the Jews accepted the Torah they were facing the mountain and their backs were turned to the world.
To accept the Torah means to turn your back to the world and to be completely focused on the task at hand. AFTERWARDS one turns back to the world and applies the Torah to his life and spreads the light. Im bechokosai teleichu - If you WALK in my statutes, one must take it with him wherever he goes.
But when accepting, when in Yeshiva, the world doesn't exist.
Mount Sinai is also called Har Choreiv - Mountain of Destruction. To stand at Sinai means the world is destroyed.
This Shavuos, let us face the mountain.
[Based in part on the teachings of Maran HaRav Hutner Ztz'l]
Love and blessings:)