The Talmud is discussing repentance, as Yom Kippur famously atones for sin: “For on this day shall atonement be made for you, to purify you from all your sins” (Leviticus 16:30).
Our sages outline how some problems are more difficult to achieve repentance for. The worst is a “desecration of His Name” (Hillul Hashem). The Gemara does not specify an act that constitutes such a major desecration but does include causing others to sin.
Rav, a sage who lived about 1800 years ago, gives the example of taking meat from the butcher without paying immediately, since others would think he is trying to get out of paying. If a respectable Rabbi was suspected of avoiding his bills, other people would certainly do the same or worse.
Yitzḥak from the school of Rabbi Yannai said: Any case when one’s friends are embarrassed on account of his reputation, this is a desecration of God’s name.
The wisdom here is that we can tell a lot about people from their friends. If their friends would be outraged by certain behaviors, then the person in question is very likely to avoid them, or at least hide them.
We used Jacob’s family to discuss how people, especially women, are deeply influenced by family and friends. You can learn a lot about a person from the people around them.
Another level is that when you pick your friends, you want to find men who are able to hold you accountable and provide useful feedback for you. If your “friends” put up with your bad or lazy behavior, these are not useful friends but enablers.
A man who has quality people in his life will think twice before acting in a way that will make them ashamed to be his friends.
The Talmud brings a contrast between Moses and David, in that Moses asked God to write his sin in the Bible (Numbers 20:12) while David asked God to conceal his (Psalms 32:1). The Gemara explains that Moses did not want people to assume that he also died because of the episode of the spies, which caused that entire generation to perish in the wilderness before the nation could enter the Holy Land.
When you make mistakes, and we all do, there is a tension. On one hand, you don’t want others to know about your failures, and you don’t want to waste your energy feeling bad for yourself. But you do need to recognize your problems and work to improve yourself.
Moses and David together provide a profound method for acknowledging your issues and moving on. David himself did not forget his failures, see Psalms 51:5. But he did not let allow them to derail his progress and mission.