Here is a sentence: As she was leaving, I was watching her from my car, heavy-hearted, recalling with melancholy the days we had spent together. The context clue of restatement or synonym here is heavy-hearted. Even if the reader doesn't know the meaning of the word melancholy, they will get a hint to its meaning from this restatement.
The repetition emphasizes Johnson's belief in justice, and he guarantees to the American people that he will do everything in his power to ensure equal rights for all.