The Talmud is discussing the ritual of bringing willow branches to the Temple during the holiday of Sukkot. There is a debate over if this was done due to a hint in scripture (Leviticus 23:40), or was a tradition dating to Moses, or was an enactment of the ancient prophets, or a mere custom of the prophets.
The Gemara brings a teaching that it was enacted by the prophets, but contrasts: didn’t Rabbi Yoḥanan say in the name of Rabbi Neḥunya of the valley of Beit Ḥortan: The law of the ten saplings, the mitzva of the willow branch in the Temple, and the mitzva of the water libation on the altar during the festival of Sukkot are all a laws transmitted to Moses at Mt. Sinai?
The Talmud explains that the original law of the willow from Moses was forgotten due to the destruction of the first Temple and exile to Babylon, but when the prophets returned to Jerusalem they reestablished the practice.
This is an important concept to live by. You may have rules that you live by, but during a tumultuous or volatile time in your personal history these fall by the wayside. When something was working for you, it is important to remember it and bring it back into practice. Our ancient prophets were not only seers but community leaders. They realized that to succeed in the era of the second Temple, the Jews needed to restore some of the glory or the original Temple.
Likewise, a man who used to excel in some area but has been drawn away from it should try to return to his strength. Perhaps you were on a sports team or used to lift. You may not be as fast or strong as you were, but you can make the effort to continue your prior efforts. A man who had his chosen personal boundaries, but failed to enforce them, needs to work very hard to reestablish these.

