Of Schism

We must now consider the vices contrary to peace, which belong to deeds: such are schism, strife, sedition, and war. In the first place, then, about schism, there are four points of inquiry:(1) Whether schism is a special sin?(2) Whether it is graver than unbelief?(3) Of the power exercised by schismatics;(4) Of the punishment inflicted on them.

Articles list

Whether schism is a special sin?
Whether schism is a graver sin than unbelief?
Whether schismatics have any power?
Whether it is right that schismatics should be punished with excommunication?