Because in worship we hear God’s word to us.
According to Eugene Peterson, “There is simply no place where [this] can be done as well as in worship. If we stay at home by ourselves and read the Bible, we are going to miss a lot, for our reading will be unconsciously conditioned by our culture, limited by our ignorance, distorted by unnoticed prejudices. In worship we are part of ‘the large congregation’ where all the writers of Scripture address us, where hymn writers use music to express truths that touch us not only in our heads but in our hearts, where the preacher who has just lived through six days of doubt, hurt, faith and blessing with the worshipers speaks the truth of Scripture in the language of the congregation’s present experience. We want to hear what God says and what he says to us: worship is the place where our attention is centered on these personal and decisive words of God.”
From: A Long Obedience in the Same Direction: Discipleship in an Instant Society, p. 55.