N.T. Wright elaborates on the necessity of Word and Sacrament in the Church in his book Following Jesus:
The visible word and the written word – or, if you like, the edible bread and the audible bread – go closely together, as they did for the two on the Emmaus road in Luke 24. Following Jesus, after all, involves heart, mind, soul, and strength. A church without sermons will soon have a shriveled mind, then a wayward heart, next an unquiet soul, and finally misdirected strength. A church without sacraments will find its strength cut off, its soul undernourished, its heart prey to conflicting emotions, and its mind engaged in increasingly irrelevant intellectual games. (xi)
