Jesus said answers a need to collect together the things which Jesus told his followers and to examine them. The gospels tell Jesus' story. In it is embedded his teaching. Jesus said finds a consistent message in the many things that he said.
Jesus addressed all sections of the community. There were the masses who followed him, the twelve whom he chose, the professional scribes and Pharisees and the religious leaders. He had a different approach to each. The overall message was the same. It is God's message to us. Jesus said does not try to form a doctrine out of the sayings of Jesus, or to fit them into a doctrine. It simply aims to uncover what Jesus said. The book is for thinking people, looking for greater depth to their Bible study.