The 9th of Av is a very sad day for the jewish people, the great Beis Hamikdash (Temple) was destroyed, twice! It is a day where we all fast and do repentance so that it becomes a Yom Tov (Holiday) as it was meant to be. There are many different halachot (laws) on what we are supposed to do and not supposed to do, there is even an halacha that it is forbidden to learn Torah cause it brings joy to our heart. 

Not all of Tisha BeAv are bad news or sad customs, in fact, we can see the light at the end of the tunnel. There is a midrash that the Bnei Issachar brings that says that the soul of the mashiach  (messiah) was born on this very day. Why on this day? One of the students of the Baal Shem Tov explains it as follows: 

The birth of a neshama (soul) is coming from the unity of the upper realms...

Rabbi Isaac Luria Ashkenazi (1534-1572), better known as the Arizal was the father of the modern Kabbalah. He was born in Jerusalem, at a young age his father passed away so his mother took him to Egypt to a wealthy uncle of his. Time passed and the Ari started to gain more popularity. He moved to Safed where he met with one, if not the closest, of his closer students: Rabbi Chaim Vital. 

The Arizal, even though he lived few years, accomplished to transfer a lot of his wisdom to his students and the generations to follow. At that time the main Kabbalist of Safed was the Ramak (Rabbi Moses Cordovero), when he passed away the Arizal started to teach Kabbalah. The rabbis started to question themselves asking “who does this young men thinks he is to teach such an advanced topic?” The Radbaz (Rabbi David ben Solomon ibn Abi Zimra) came to the Ari and forbade him to continue teaching, then he saw a signal (some say it was Elijah the prophet) that his ruling was wrong and let The Arizal continue his teachings. 

In order to express how big The Arizal was here’s a story of his birthday: 

When the Arizal was about to born Eliyahu HaNavi (Elijah the Prophet) came to his father, who was very righteous, telling him “be careful...