This is the whole Torah, the rest is commentary, now go and study it. One of the Mitzvot, commandments, mentioned in this week's Torah portion is that of Ahavat Yisrael - loving one's fellow as oneself. This is the entire Torah, the rest is commentary. The Lubavitcher Rebbe explains that Hillel, in his profound wisdom, chose to clarify this Mitzvah in a way that would clearly define this precept. It is an accepted truth that'love is blind' and the blindest of all love is self-love.
Every person is aware of their own faults.
One knows of one's own shortcomings better than anyone else. Yet, so strong is one's self-love that it smothers this awareness and does not let one feel one's shortcomings and one will always find excuses for wrongdoing. Let us take an honest look at ourselves and note our reaction when someone brings our faults to our attention. We are annoyed, because we feel that our fault may have made a negative impression on another person, and we do not make light of our deficiencies. This negative observation has forced us to remove the blindfold from ourselves and face up to our shortcomings - which may be truly hurtful.