Read this excerpt from The Iliad.

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 subject, grown too wise
Instruct a monarch where his error lies;
Invidious means getting others angry, what key words support this inference?

protection, monarch, sword
speak, wisdom, conceal
truths, great, bold
sword, wisdom, subject