1. Whereas in the Catholic Church the word and Churches Doctrine held equal weight.

2. Galileo's view contradicted Church doctrine of the time that the earth was in a fixed position.

3. He must therefore demonstrate this rational content without appealing to church doctrine.

4. Hitherto Barchester had escaped the taint of any extreme rigour of church doctrine.

5. He incorporated Greek ideas into Christianity by showing Aristotle's thought to be compatible with church doctrine.