Given all the support in the world, even the best teacher can’t force his students to learn. Students aren’t simply passive vessels, waiting to absorb information from their teachers and regurgitate it through high-stakes assessments. They make choices about what they will and won’t learn. I know I did.

My best teachers, the ones I still think about today, exposed me to new and exciting ideas. They created classroom environments that welcomed discussion and intellectual risk-taking. Sometimes, these teachers’ lessons didn’t sink in until years after I’d left their classrooms. I’m thinking about Ms. Leonard, the English teacher who repeatedly instructed me to “write what you know,” a lesson I’ve only recently begun to understand. She wasn’t just teaching me about writing, by the way, but about being attentive to the details of my daily existence.

It wasn’t Ms. Leonard’s fault that 15-year-old me couldn’t process this lesson completely. She was planting seeds that wouldn’t bear fruit in the short term. That’s an important part of what we teachers do, and it’s the sort of thing that doesn’t show up on high-stakes tests.