Psychology of Persuasion: Logos, Ethos, and Pathos

More than 2,000 years ago, Aristotle gave the questions "does this make sense? do I trust you? why should I care?" names: logos, ethos, and pathos. And despite being older than PowerPoint by a few millennia, they’re still pretty useful.

Logos: The Logic Appeal

So what is logos? Simply put, it's evidence, statistics, logical reasoning. Saying something like 4 billion people like soccer is an example.

But when should you use logos? When your audience values facts and data. If you just tell me the four billion dollar stat, great! You've dropped a fun fact. But when you weave it into the larger context (Four billion people follow soccer, which helps explain why events like the World Cup can capture attention across countries, languages, and cultures), now you've explained why the statistic matters.

In essence, logos is like logic, supported by evidence. But it's up to you to make that evidence matter.

Ethos: The Credibility Appeal

Ethos is credibility, the audience’s belief that you are informed, fair, and worth listening to. And contrary to popular belief, ethos is not just saying, “According to Stanford…”

You can build credibility through a few ways:

• Experience: Is what you're saying based on your own experience? Maybe you've conducted research in this field. Or you've participated in an activity for over a decade.

• Expertise: Demonstrate that you know the ins and outs of the topic, not that you've just done a quick google search. It's harder to convey expertise in a speech since you typically don't have enough time for an autobiography, but this can be woven subtly through your speech

• Reliable sources: Citing respected researchers or organizations. Look to my previous blog post about writing with evidence.

• Fairness: Recognizing that the other side may have a valid point. And no, this isn't weakness; it's actually being strategic. When you admit that the validity of the other side, you're demonstrating expertise (that you know the topic and are willing to acknowledge counterarguments) and paving the way for some interesting discussion on why your argument ultimately prevails.

So, to summarize, ethos is basically why someone should trust you.

Pathos: The Emotional Appeal

Facts can tell us that something matters. Stories can make us feel why it matters. Suppose you're giving a speech about student homelessness. You could say that thousands of American students experience homelessness each year. It's important...but feels distant. But if you ask your audience to imagine finishing your homework at school because you don’t know where you’ll be sleeping that night, suddenly, the issue has a human face.

Pathos can come from personal stories, humor, imagery, frustration, hope, fear, nostalgia, or even a well-placed pause.

But pathos does not mean making everything unnecessarily dramatic. Not every speech needs tears and inspirational background music.

The goal is simply to make an abstract issue feel human.

The Real Formula: Blend Them

Imagine you're arguing that high schools should start later.

Pathos: Imagine taking your hardest exam after getting five hours of sleep. And it's not once, but every morning.

Logos: The NIH has linked insufficient adolescent sleep to poorer concentration, health, and academic performance.

Ethos: Acknowledge that later start times can create real transportation and scheduling challenges, then use credible research to explain why the benefits may outweigh them.

Don’t Force the Order

There is no magic sequence of pathos → ethos → logos that automatically produces a persuasive speech.

Sometimes a story is the perfect opener. Sometimes a shocking statistic is. Sometimes your personal experience establishes credibility before you say anything else.

Instead of asking: “Did I use logos, ethos, and pathos?”

Ask: Does my argument make sense? Have I given my audience a reason to trust me?Have I given them a reason to care?

A speech made entirely of logos can sound like a research paper. A speech made entirely of pathos can feel manipulative. And a speech without ethos may leave everyone wondering why they should believe you at all.

The strongest persuasion happens when your audience walks away thinking:

I get it. I believe it. And I care. Aristotle figured that out 2,000 years ago. The least we can do is use it.