According to tradition, Moses was born on the 7th of Adar I, today was the 8th day of his life and the day on which he was circumcised in accordance with the Divine command to Abraham.
In regular years, the 14th of Adar is Purim, the festival that celebrates the salvation of the Jewish people from Haman's evil decree in the year 3405 from creation (356 BCE). In a leap year -- which has two Adars -- Purim is celebrated in Adar II, and the 14th of Adar I is designated as Purim Kattan, the "Little Purim." There are no special observances, however, associated with Purim Kattan, other than the omission of Tachnun ("supplications") from the daily prayers and a prohibition against fasting or holding eulogies on this day. The Code of Jewish Law cites an opinion that one should increase in festivity and joy, but rules that there is no obligation to do so; "Nevertheless,a person should increase somewhat in festivity... for 'One who is of good heart is festive always' " (Shulchan Aruch, Orach Chaim 697:1).
Link: Always Happy
A young man came to the Rebbe to receive his blessing. The Rebbe looked at him and said, "A Jew must be happy!"
The young man replied, "Rebbe, what is there to be happy about?"
The Rebbe answered, "Be happy that you were privileged to wrap tefillin this morning!"
The young man mumbled a few words that made the situation quite obvious.
The Rebbe responded, "Be happy that you have a G‑d who waits every minute for the moment you will return to Him and wrap tefillin!"