Use a selection of writing strategies to grab your readers' attention and drive your point home when you are presenting an argument and want to inspire your audience to accept your views.  The use of figurative language (a "bridge to the twenty-first century," for instance); of clear, direct language, of language to establish common ground, such as the inclusive use of we and of repetition to drive home a point occurs often in oral presentations, but can also be used to good effect in writing.  Martin Luther King, Jr., was a master of rhetorical devices to involve his audience, as we can see in this excerpt from his "I Have a Dream" speech to civil rights protesters in 1963:

We have also come to this hallowed spot to remind America of the fierce urgency of now.  This is no time to engage in the luxury of cooling off or to take the tranquilizing drug of gradualism.  Now is the time to make real the promises of democracy.  Now is the time to rise from the dark and desolate valley of segregation to the sunlit path of racial justice.  Now is the time to lift our nation from the quicksands of racial injustice to the solid rock of brotherhood.  Now is the time to make justice a reality for all of God's children.        --Martin Luther King, Jr., "I Have a Dream"