PCA pastor Jeff Meyers, in his book The Lord’s Service, captures this point well:
“Even if we cannot define it precisely, God is nonetheless present in a heightened special sense when His people gather as the church on the Lord’s Day. For one thing, He is present there “for us.” This is a place and time where he gathers His people around the Word and Sacraments…The bread and wine are singular signs designed to assure us of His special, gracious presence with us.”
If we believe this, it should radically change our view of Sunday worship. We do not come to worship primarily to “do” something for God, but to enter his presence and receive something from him!