Give a concise summary of the issues at stake in the Donatist controversy. [answer]

Augustine of Hippo wrote of the Christian church being like a hospital. Why? [answer]

The doctrine of the church is often described as the 'Achilles' heel of the Reformation.' Why? [answer]

'How can anyone speak of one church, when there are dozens of Christian denominations?' Summarize and assess the answers that could be given to this objection. [answer]

'How can the church be holy, when it is full of sinners?' What answers could be given to this question? [answer]