"One year, most of Adar went by and it didn't rain. They sent for Choni the Circle Maker. He prayed and the rains didn't come. He drew a circle, stood in it and said: 'Master of The World! Your children have turned to me; I swear in Your great name that I won't move from here until You have pity on Your children.' The rains came down." (Talmud, Taanit 23a)
Link:
Choni the Circle-Maker
Adar 20 is the yahrtzeit (anniversary of the passing) of Rabbi Yoel Sirkes (1560?-1640), Rabbi of Krakow and author of the Bayit Chadash ("Bach") commentary on the great Halachic work, the Arba'ah Turim.
People might tell you, “When you come to work, leave your spirituality at home. Don’t bother us with your peculiar lifestyle, your ethics, search for meaning . . . That’s all nice, but this is business. This is the real world.”
There is only one real world, and it belongs to one real G‑d.