How to Write a Speech Using Logic


Logic, not to be confused with a lack of emotional involvement, is an effective way to prove an argument in speeches if used correctly. Dating to Aristotle, logic has been employed in writing and speeches for millennia. Composed of a series of premises and conclusions, formal logic can be tricky to grasp at first, but is very valuable when trying to convince an audience.

Things You'll Need

  • Something to write with
  • Evidence for your argument (books, websites, etc.)

Logical Sequence

  • Understand the idea of a logical sequence before you begin writing a speech. In logic, the argument is not a discussion leading up to a conclusion, but rather the conclusion itself. Logical arguments are made from at least two premises, which are assertions made by the speaker as evidence to verify the conclusion. In order to reach that conclusion, the premises must be delivered in such a way that they connect to form the argument. For example, a famous argument of Aristotle's was:

    Premise 1: All men are mortal.
    Premise 2: Socrates is a man.
    Conclusion: Therefore, Socrates is mortal.

    This is often stated as "If A and B, then C," meaning that if both premises are true, the conclusion must also be true. This is the key concept in using formal logic. (See Reference 1.)

  • To write using logic, you must first decide on the argument(s) you want to prove in your speech. Clearly define what point you would like to make to your audience. There may be several arguments you wish to make within your speech.

  • Lay out the premises that form the connection to your conclusion. It is best to use premises that an audience will understand and accept. For example, "All politicians are greedy" is a premise with which members of an audience may disagree, and it will therefore undermine your argument to them. (See Reference 2.)

  • If there is any cause to speculate about a premise, back up your claim with evidence. For example, if you propose that "a new gym will benefit only 50% of the school's students," explain to your audience why this is so. Statistics and references are useful for providing evidence.

Tips & Warnings

  • Do not assume that "if A and B, then C" can be applied as "if A, B, C, D ... then Z." Each premise must connect with the others, but will not automatically prove your conclusion. Remember to provide evidence for each premise so the audience can clearly see the connections to your conclusion.


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