See here for the liturgy we used to reflect on John the Baptist during this season of Advent.
Also attached is a sermon preached by Rowan Williams on Advent.
So again for Christians, Advent is a time when they do a bit of self-examination. Have I allowed Jesus in yet? Has the good news really made the full impact it might make, or is my life still locked into old patterns, into darkness, into slavery, into being not at home with myself or God or with other people? It’s a time of self-examination, of repentance indeed, facing myself honestly and saying sorry for the things that don’t easily face the light. And it’s a time of expectation and a time of hope. A time, therefore, also of quiet.