Priests were set-apart from others. They were called to different standards and a different way of life.
But they were far from perfect! In fact, they failed in this task miserably!
So God One who would fulfill this function – perfectly and forever: Jesus! And now, He intercedes – faithfully, mercifully, and lovingly on our behalf forever; and through faith in Him, we are covered with His perfection; set apart by God!