Likutei Sichos – Vol 15 p 75 ff ANOCHI happened at Har Sinai. Hashem wrote Himself [His Will] into the Torah. It is now beyond reason. It cannot be compared to the pre Mattan Torah Torah. Page 75-6.

Likutei Sichos – Vol 15 p 75 ff The difference between before and after Mattan Torah. Mitzvos as people vs. Mitzvos as G-dly people. Page 75.