The Baal HaTanya zt'l said to a student of the Magid of Mezritz zt'l, "I have an obligation to teach my son Torah, as it states (Devarim 6:7) לְב ָנֶיךָ וְשִׁנַּנְת ָּם, and you have an obligation to bring parnassah home. Let's change places. You will teach Torah to my son [who later became renowned as Rebbe Dov Ber, the Mittele Rebbe zt'l], and I will take on your obligation, because I will pay to teach my son." The Baal HaTanya gave him an outline of what he should teach his son. He said, "The first thing is to teach the alef beis. Tell him about the first letter, the alef, 'א. Tell him how it appears: a dot above, a dot below, and the letter 'ו in between, connecting them..." (HaYom Yom 8th of Adar)
The vav represents emunah. The letter 'א tells us that one must believe that everything that happens below is connected and decreed from Above. This includes even the most minor details of life (represented by the small dot at the bottom of the alef). Even these seemingly minor details were decreed from above.
