the moving speech of one of his councillors is given by the Venerable Bede
in his Ecclesiastical History
The sparrow is Bede
'..the SWIFT flight of a LONE SPARROW through the banqueting hall where YOU sit in the winter months to DINE with your THANES & COUNSELOR'
SWIFT= represents how the old traditional views on religion are SLOW to accept change.
LONE SPARROW= represents the minority of christianity vs. the large and powerful catholic church.
YOU= the Catholic leaders who are apprehensive to change because they love POWER, NOT the people.
DINE= to live in luxury like a celebrity (this means the catholic leaders are not humble like they pretend to be)
THANES & COUNSELOR = the entire network of people associated with the Catholic Church are vain and selfish, and do not care about the well being of humanity.
The sparrow also means: birds = the human Soul... A Flight of the winged soul back to God.
.....therefore, it is inevitable that the Catholic Church's deceptive behavior will come to an end, and that the rise of Christianity is a natural antithesis (evolution) of humanity.