What is Yom Kippur?
Though these Days of Awe, as they are often called, are solemn, they are not sad. In fact, Yom Kippur is, in a subtle way, one of the happiest days of the year.
For on Yom Kippur we receive what is perhaps G-d's most sublime gift: His forgiveness. When one person forgives another, it is because of a deep sense of friendship and love that overrides the effect of whatever wrong was done. Similarly, G-d's forgiveness is an expression of His eternal, unconditional love.
Though we may have transgressed His will, our essence - our soul remains G-dly, and pure. Yom Kippur is the one day each year when G-d reveals most clearly that our essence and His essence are one. Moreover, on the level of the soul, the Jewish people are all truly equal and indivisible.
The more fully we demonstrate our essential unity by acting with love and friendship amongst ourselves, the more fully G-d's love will be revealed to us.