We have to enquire how far it is possible to discover the actual content of the Gospel preached or proclaimed by the apostles. (religion-online.org)
To begin with, Paul himself was conscious of a distinction between the fundamental content of the Gospel and the teaching which he based upon it. (religion-online.org)
The whole content of the gospels shows us that the disciples could indeed imagine to rule together with Jesus soon, therefore Jesus had to take Peter down a peg a little, after Peter had acclaimed Jesus as Christ (the king). (religion.blogs.cnn.com)