As I have studied the history of Christianity, there are 2 major themes that can be seen as changing from era to era. The first one will be addressed today, the others in following posts. Actually, I will give the bare bones list of them and address them one at a time in following postings. These 2 themes can be summed up by 2 questions: ‘How does one express himself/herself in devotion to God?’ and ‘What is the thing or person from which you get your theological authority?’ It is a feature of all religions to determine the requirements of the particular deity for acceptance. All people ask, ‘What do I need to do to please my god?’ So all Christians ask ‘What does it mean to be totally devoted to God?’ in other words ‘How does one express himself/herself in devotion to God?’ Even though it can be said at all times true discipleship means to do what Jesus teaches, but this manifests itself in various ways at different time periods. So I have noted many of these and boiled them down to a few key terms and times. These key ideas are, in this order (chronologically): Martyrdom, Monasticism, Crusades, Scholasticism, and Piety. Each will be addressed later in more detail.