That is the depth of the giving of the Torah.
The world was created for the sake of the Torah and for the sake of Yisrael, which are both called raishis/beginning. Before the giving of the Torah, there was just a world. After the Torah was given, there was now a revelation that the beginning of the world was not only for the sake of Torah and for the sake of Yisrael, but that Torah and Yisrael are the shvil, the path, by which all Heavenly sustenance comes to the world (as the Nefesh HaChaim explains). At the giving of the Torah, the true raishis was revealed – not the simple beginning of Creation which took place on the first day of Creation, but the true [inner] beginning of Creation - which was the Torah that Hashem looked into to create the world.
