When there are a number of worshipers present, there is a participation in worship which is more intense than is the individual passion of any one when he is by himself. It is common knowledge that a mob is is more cruel than any individual in it would be by himself. Similarly, the enjoyment of an elite company of music lovers at the symphony is more intense than that of a single music lover sitting by himself listening to the same music. God has so created man that there are deeper delights and more intense inspiration in the worshiping congregation than in individual devotion.
-Robert Rayburn, O Come, Let Us Worship (quoted by R. Kent Hughes in Worship by the Book)