In All Honesty

The Gemara states that Rabbi Yochanan ben Zakai was actively involved in business for forty years. Undoubtedly, during those years, he understood all the deceptive tactics that an unscrupulous dealer may employ. Rabbi Yochanan then contemplated delivering a shiur that delved into the topic of honesty during commerce, drawing upon his own extensive experiences. This shiur would ensure that honest businessmen do not inadvertently commit fraud.
However, giving this lecture would reveal many deceitful practices. This left Rebbe Yochanon in a dilemma. If he delivered the lecture, dishonest people would learn new ways to trick their customers. On the other hand, if he refrained from delivering the discourse, fraudsters would claim, “The only reason these righteous people are honest is because they don’t know any other way. Surely, if they were as knowledgeable as we are about these deceptions, they would be the same criminals we are.” This weak attempt at self-justification would encourage the thieves to commit more crimes. They would argue that everyone, deep down, is as dishonest as they are. The lecture would dispel this notion, and show that although righteous people are indeed knowledgeable about acts of trickery, they remain honest.