Rhetorical Strategy in Civil Rights Speech

Read the following excerpt from a speech given by a civil rights leader:

“When we look back at the long arc of our struggle, we see that it is not merely a fight for rights, but rather a quest for dignity. In the face of oppression, we have chosen to lift our voices not in anger, but in a unified proclamation of our humanity. Our strength lies not just in our numbers, but in our unwavering commitment to justice and equality for all.”

In the context of this excerpt, which rhetorical strategy is primarily employed by the speaker to convey the message of unity and resilience?