A teacher must never see the flaw of his student. One who gives to another must see only his "whole", his receiving side. This is what Chazal said (Rosh Hasana 32): "The sun never saw the flaw of the moon".
Baal Shem Tov, quoted in Nesivos Hachinuch.
Comment: This saying is drawing upon and referencing the following gemara: ""The countenance of Moshe was like that of the sun; the countenance of Yehoshua was like that of the moon." (Bava Basra 75a)

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