Moshe's Red Heifer

Moshe's Red Heifer:

"Divine Will emanating within the commandment of Parah Adumah.
This is also one of the reasons why Parah Adumah is considered the general aspect of the Torah.[4] Which is why the verse employs the terminology 'This is the chukah of the Torah,'[5] rather than 'This is the chukah of the Red Heifer.' By doing so the Torah indicates that Parah Adumah is a foundation for the entire Torah and its commandments, Mishpatim and Eidos included.

The reason for this is because all Torah commands, even Eidos and Mishpatim, are fundamentally expressions of the Divine Will that utterly transcends logic. Merely, with regard to Eidos and Mishpatim it was G-d's desire that the Divine Will underlying these commands also descend within the realm of reason.[6]

Since the aspect of Transcendent Will finds its greatest expression in the commandment of Parah Adumah, it is therefore deemed to be the general and overall aspect of Torah. As such, its proper performance necessitates the service of the soul's essence. This is accomplished through one's connection to Moshe, to whom the 'reason' for Parah Adumah was revealed"

Aharon Moshe's Notebook, Parshas Chukas
http://thewriterscafe.org