Read the passage.

From John F. Kennedy’s Inaugural Address To those new States whom we welcome to the ranks of the free, we pledge our word that one form of colonial control shall not have passed away merely to be replaced by a far more iron tyranny. We shall not always expect to find them supporting our view. But we shall always hope to find them strongly supporting their own freedom—and to remember that, in the past, those who foolishly sought power by riding the back of the tiger ended up inside.
Which rhetorical device is used in this passage?

parallelism

antithesis

emotion

repetition