The Revelation of Shabbos is the Goal of Creation

From B'yam Darkecha on the Beauty of Shabbos & the Yomim Tovim: R Yossi Michalowicz by R Yossi Michalowicz.

pp. 243 - 245: Shabbos is not another day like the preceding six days - it is exactly the opposite ! Hashem calls Shabbos - "My day" because only on Shabbos is the light of Hashem revealed in a way that it actually is (not through the conception of the 6 days).