Commenting on Matthew 13: 53-58, William Barclay says,
“There is a great lesson here. In any church service the congregation preaches more than half the sermon. The congregation brings an atmosphere with it. That atmosphere is either a barrier through which the preacher’s word cannot penetrate; or else it is such an expectancy that even the poorest sermon becomes a living flame.” (p. 92)
What a responsibility for every congregation.
William Barclay, The Daily Study Bible: The Gospel of Matthew, Volume 2, Chapters 11-28 (Edinburgh: The Saint Andrew Press,  1975)