When I took Spanish in high school, I learned very little. After two years of classroom instruction, I could say hello and ask where my shoes were—hardly the foundation of fluency. My teacher was wonderfully eccentric (I still tell stories about him), but his intense focus on perfection created anxiety, and his quirks—like frequently apologizing to the pencil sharpener—often distracted more than they engaged. When we did focus on language acquisition, it was mostly grammar drills, which drained the joy from the process and did little to help us actually communicate.

As I’ve learned more about how language acquisition works, I’ve come to recognize just how many ways his approach worked against us. It wasn’t for lack of passion—he clearly loved Spanish and loved teaching—but he lacked the tools to teach the subject effectively. Because of that, we lacked the tools to learn it efficiently.

One theory we had access to even back then was Krashen’s Affective Filter hypothesis. It suggests that emotional factors—like anxiety, stress, and boredom—can raise a mental “filter” that blocks language input. On the other hand, feelings of confidence, comfort, and curiosity can lower that filter and make learning easier.

The Affective Filter can complicate language learning both inside and outside the classroom. Formal instruction pushes us to improve, but correction often feels like judgment. Add in the fact that language is what connects us socially, and it’s no surprise that learning in public can feel scary. If we’re afraid of making mistakes, we’re less likely to try—and trying is everything in language learning.

Teachers can do a lot to lower the filter. They can create welcoming classrooms, design exciting lesson plans, and normalize mistakes as part of the learning process. Most importantly, they can emphasize the fun of building communication skills—of connecting with others in a new way.

Learners, of course, can’t always change how a teacher teaches. But they can change how they learn. When someone is motivated by intrinsic factors—love of the language, the culture, the process itself—they’re more likely to have a lower affective filter than someone learning for external reasons, like financial incentives. Language learning becomes easier when the reward is the learning itself.

Shifting one’s attitude can also make a big difference. In the U.S., we often treat being wrong as a moral failure. That mindset shuts down the willingness to make mistakes—and making mistakes is how we get better. When we stop seeing errors as flaws and start seeing them as opportunities, we reduce fear and stress and open ourselves up to real growth.

Above all, language learners can benefit by making the process enjoyable. That means figuring out how we learn best, finding fun and meaningful ways to build our skills, and connecting with native speakers or fellow learners. It might take time and self-reflection, but discovering your own learning style can dramatically reduce how much your affective filter gets in the way. Whether it’s through community events, hobbies, or personal interests explored in your target language, enjoyment keeps you engaged. Sharing those experiences with someone who speaks the language not only gives you more practice but strengthens your social connections as well.

Looking back, I think a better understanding of the Affective Filter—and a classroom designed to lower it—might have helped me actually learn Spanish in high school. That said, I’m not off the hook. I liked the language, but I wasn’t internally motivated. I did the bare minimum to get an A (which wasn’t hard), and that approach left me with little to show for the time I spent. But I’ve learned from that experience. It wasn’t the language that held me back—it was my mindset. Now, I focus on keeping my motivation high and my learning process enjoyable. And it’s made all the difference.