iliad 1 invite meeting of secrets

"Beloved of Jove, Achilles! would'st thou know
Why angry Phoebus bends his fatal bow?
First give thy faith, and plight a prince's word
Of sure protection, by thy power and sword:
For I must speak what wisdom would conceal,
And truths, invidious to the great, reveal,
Bold is the task, when subjects, grown too wise,
Instruct a monarch where his error lies;
For though we deem the short-lived fury past,
     There is a call to Achilles to vow under the rules of the hospites of princely and kingly secrecy.  This bond is of the sword and the faith of the unity of assembly and the authority of that system thereof.  What must ve revealed is great and grave and if people become wise to it they will become disorderly and harder to handle
    The monarch looks for advice though the greater calamity has past.
from
http://www.gutenberg.org/files/6130/6130-h/6130-h.html#toc5