Recently I was reading Barbara Brown Taylor's book "An Altar in the World". In it she talks about some important "practices" that she thinks we as spiritual people ought to pursue. One of them is the practice of "saying no." That chapter (which echoes Wayne Muller's thoughts in his book "Sabbath") really spoke to me. Taylor suggests that in our culture we are conditioned to say "yes", and see "yes" as they way to find success and joy. "Yes, I want the job", "Yes I will marry you", "Yes I will help!"
Taylor references Abraham Heschel who says that the first holy thing in all creation was not a people or a place but a day, "a place in time.. into which human beings are invited every single week of our lives."