Rhetorical Strategy in Speech Analysis

Read the following excerpt from a speech given at an international summit:

“As we gather here today, we are not merely participants in a conference; we are architects of a future where diversity isn't just tolerated, but celebrated. It is our responsibility to dismantle the barriers of prejudice and build bridges of understanding. Let us visualize a world in which every voice is heard and every culture is honored—this is the legacy we must pursue.

Many ask, 'What can one person do in the face of such overwhelming issues?' But I remind you: even a single drop can create ripples across a vast ocean. Together, we have the power to ignite change that resonates through generations. Will we rise to this calling?

Based on this excerpt, which rhetorical strategy is primarily employed by the speaker to enhance the message?