Refer to Explorations in Literature for the full version of the “Four Freedoms” Speech by Franklin Delano Roosevelt. Read the sentence from "Four Freedoms Speech."

Third, by an impressive expression of the public will and without regard to partisanship, we are committed to the proposition that principles of morality and considerations for our own security will never permit us to acquiesce in a peace dictated by aggressors and sponsored by appeasers.

What is the purpose of the sentence?

to encourage Americans to think that their nation will always win

to assure listeners that Roosevelt understands the opposing view

to convince the audience that fighting dictatorship is the right thing to do

to attempt to silence members of Congress who disagree with him