The regulative principle in its strict Restoration form — that silence prohibits rather than permits — is the engine of every division in the movement. It excluded the instrument, because the New Testament mentions singing and not playing; it excluded the missionary society, because the New Testament shows congregations sending directly; it was pressed further by some to exclude Sunday schools, multiple communion cups, and paid located preachers, producing the non-institutional or non-class Churches of Christ that still exist. The 1906 United States religious census listed Churches of Christ and Disciples of Christ separately for the first time, which is conventionally taken as the date of the split, though David Lipscomb had told the census director that the separation was already a fact. The dividing lines were the organ and the missionary society, and underneath them a sectional and class division between a poorer, rural, southern constituency and a wealthier northern one.