Dear Rabbi, Would you kindly tell me what wonderful and good thing happened on the 17th of Tammuz in our history?

The 17th of Tammuz has always been a day of great promise that unfortunately was never realized and, unfulfilled, was replaced by sorrow. It was the day Moses would have joyfully descended from Mt. Sinai with the first tablets of the Law had there not been the sin of the golden calf. The prophets and the rabbis teach us that the 17th of Tammuz is one of the days that will become, with the rebuilding of the Temple, a new Jewish holiday, once the promise that was always inherent in the day becomes reality. If a Jewish child is born on the Fast of the 17th of Tammuz, the family should see it as a harbinger of the joy the future holds for the Jewish People.