Act with humility and be embarrassed to do something wrong in front of anyone

"May it be that you fear Heaven as [much as] you fear man." (Brachos 28B) This is the blessing that Rabbi Yochanon Ben Zakkai gave to his students. When they asked him why he gave them such a strange blessing, he answered, "May it be Hashem's will, that you should have that much fear of Hashem..." Even if a man does not understand how bad it is to sin in front of Hashem, at least he is emabarrassed to do so in front of people. R' Yochonon gave his students a brocho, that they should be as embarrassed to sin in front of Hashem, as they are to sin in front of people. (Etz Yosef)
A Project of Pirchei Shoshanim 1996
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