Due to the limitations of our finite human minds, we cannot attain ultimate Divine consciousness on our own. G‑d therefore revealed Divinity in such a way that we can grasp it, by giving us the Torah. Once this had been accomplished, the next step was to prepare the world to absorb the G‑dliness that is inherent in the Torah, for without preparation on our part, Divine revelation cannot be absorbed into our being, and therefore cannot elevate us in any meaningful or lasting way.
G‑d gave us the Torah through Moses, but Aaron was the one who made society receptive to G‑dliness by inspiring the people to aspire to the spiritual life. It was therefore Aaron who completed the process of Divine revelation begun by Moses. The rites that Moses performed in the Tabernacle’s installation rites did not reveal G‑d’s presence; only those that Aaron performed accomplished this.
We all desire to feel G‑d’s presence in our lives. In order for this to occur, we must imitate Aaron: “love peace and pursue peace; love your fellow creatures and bring them close to the Torah.”1
I sometimes see it said that we must bring the world to Godliness but we haven’t accomplished this. The world won’t listen to us. Right now all we can do is Torah and Mitzvot where we are to brighten up our corner of the world. Maybe when Moshiach comes people will be receptive to us.
Many of us are already listening by protesting for peace throughout the world. Others are trying to achieve peace through war, to bring down the Iranian regime. But innocent people always get hurt in war. It's up to us to decide which is the more effective way to follow the Torah.