The washstand in the Mishkan was made of the hand mirrors that the women used in Mitzrayim to ensure the continuity of Klal Yisrael. Moshe Rabbeinu was reluctant to use these mirrors but Hashem said they were most precious to Him.  What was the machlokes between Moshe and Hashem. Why were these mirrors so precious? In this shiur Rav Burg explains how the way we we look at things is what makes them last. It influences the way we act in this world. Only when the Kohanim washed their hands and feet in the kiyor made from these mirrors could they bring atonement to Klal Yisrael.