Burke defined rhetoric as the "use of words by human agents to form attitudes or to induce actions in other human agents." His definition builds on the preexisting ideas of how people understand the meaning of rhetoric. Burke describes rhetoric as using words to move people or encourage action. Furthermore, he described rhetoric as being almost synonymous with persuasion ("A Rhetoric of Motives", 1950). Burke argued that rhetoric works to bring about change in people. This change can be evident through attitude, motives or intentions as Burke stated but it can also be physical. Calling for help is an act of rhetoric. Rhetoric is symbolic action that calls people to physical action. Ultimately, rhetoric and persuasion become interchangeable words according to Burke. Other scholars have similar definitions of rhetoric. Aristotle argued that rhetoric was a tool for persuading people (but also for gaining information). He stated that rhetoric had the power to persuade people if the speaker knew how. One way in which Aristotle formed his arguments was through syllogism. Another example of how rhetoric was used to persuade was deliberate discourse. Here, politicians and lawyers used speech to pass or reject policies. Sally Gearhart states that rhetoric uses persuasion to induce change. Although she argues persuasion is violent and harmful, she uses it as a tool herself to bring about change.