I begin with the obvious: Advent is a season of preparing for the coming of Jesus. For many centuries in Western liturgical churches, it has (like Lent) been a penitential season. Though it is about remembering his first coming 2000 years ago, it has also been about his second coming at the last judgment and the need for us to be prepared through earnest repentance.
Thus, like Lent, the liturgical colors for Advent have been (and for the most part still are) violet or purple, the color of penitence. Recently, in some churches, the liturgical color of Advent has become blue, reflecting a change in emphasis.
Seeing Advent as a penitential season strikes me as unfortunate. It is the product of a seriously distorted and yet widespread understanding of Christianity: namely, that the central issue in our lives with God is our sinfulness (commonly understood as disobedience and/or failing to measure up to what God requires from us) and thus our need for repentance and forgiveness. Within this framework, that’s the reason Jesus was born. As the divinely-conceived Son of God, he was sent by God to be the perfect sacrifice, the payment for our sins, so that we can be forgiven. Provided, of course, that we believe in him.
That is a serious impoverishment of Christianity and Advent. Christianity and Advent are about so much more. The central themes of the stories of Jesus’s birth (about which I will say more in my blogs about Advent in the next few weeks) are hardly at all about sin and our need for forgiveness.