Flaming torches represent illumination and enlightenment.
The opened book with the Chi Rho cross suggests that Christ through his life revealed the truths written in the Gospels. Knowledge of the good news proclaimed in the Gospels has been opened up for all.
In the beginning (the Alpha) was the Word, and the Word was with God.
At the end (the Omega) is Christ, who through his death and resurrection has given us the final gospel word - Salvation.