Class One. This Sicha was said to the supporters of the Lubavitcher Yeshiva. The Rebbe discusses the idea that spiritually we’re all Kohein Gadol and there is the Avoda of gold, where each one must use all the special strengths Hashem gave him, and the Avoda of white, that we’re all the same.
Class Two. Page 16-18. Gold and White in the Kohen Gadol’s clothes on Yom Kippur and the lesson in it for all.