The first item of the introduction argues that the currently existing translations of the Gospels were imperfect and were effectively unintelligible without proper relation to scholarly research about the culture and the customs of the peoples of the Middle-East.
The fourth part explains that even before Christ theories similar to Spiritism could be found in the Greek philosophy, notably in Socrates and Plato (Spiritists have both philosophers in high esteem and consider them as precursors of Christ).