Anyone can become like the tribe of Levi

After describing how the Leviim are set apart for Hashem's service, the Rambam adds that this is not limited to one tribe. Any person whose spirit moves him to stand before Hashem, to serve Him and know Him, and who throws off the yoke of worldly calculations, becomes holy of holies, and Hashem will be his portion and provide what he needs. Spiritual greatness is open to every soul that chooses it.