How do I obtain permission to use real quotes in a work of fiction?

As the title says: how do I get permission to use real quotes in a work of fiction?<br><br>I'm planning on writing a story and a character says this quote:<br><br>"I want justice."<br><br>His friend says:<br><br>"Oh, and you're going to do that with a baseball bat?"<br><br>The first character replies:<br><br>"Yes, I am."