"V'hizhartem es Bnei Yisroel mitumasam v'lo yamusu b'timasam. (15:31) And you shall warn the Bnei Yisroel about their impurities, that they should not die in their impurities."
I heard from Harav Naftalie Jeager Shlita, Rosh Yeshiva of Yeshiva Sho'or Yoshuv: V'hizartem can be derived from the root Nezer, a crown, It is a glorious thing for Klal Yisroel to separate themselves from all tumah. A Nazir separates himself. He wears a Crown of "separation".
In our personal struggles, we separate ourselves from our Yetzer Horah. The crowns that we wear are symbolized by those found on the 90 Day Chart & the Wall of Honor.
We joined this group when we reached the realization that otherwise we will die from the tumah - a living death. Externally we would still be walking & talking, but inside ourselves we would be dead. V'lo yamisu b'timasam!