All 613 mitzvas are engraved in the 10 Commandments. Shavuos night we can unite all the parts of the Torah. Hashem is hidden in this world. The entire Torah is the exalted revered Name of Hashem. Not possible to remain Jewish without learning Torah. The Kotzker Rebbe gave great homage to his aleph- beis teacher. Rebbe Zusha , Rebbi Elimelch and the Mezriticher Maggid. In the World to Come Hashem will learn every Torah they learned in their "lifetime."