Of Synods and Councils, XXXI:1

For the better government, and further edification of the Church, there ought to be such assemblies as are commonly called Synods or Councils; and it belongs to the overseers [elders] and other rulers of the particular churches, by virtue of their office, and the power which Christ has given them for edification and not for destruction, to appoint such assemblies; and to convene together in them, as often as they shall judge it expedient for the good of the church.

Most of this chapter is fairly self-explanatory, and familiar to those of us with a background in the presbyterian form of church government. This paragraph more or less states that assemblies of Christian churches and church members are useful. The specific benefits cited here are better government--striving toward the peace and purity of the church--and further edification--building one another up, especially with respect to Christian education (although not exclusively so). Such assemblies should meet as often as is necessary to benefit the church.

Tomorrow: Specific tasks and responsibilities of such assemblies.