After decades in the classroom, I’ve noticed something interesting about the brightest people I’ve known. They all share a peculiar trait: they’re remarkably selective about where they put their mental energy. Not in a snobbish way, but with the quiet confidence of someone who knows exactly what deserves their attention and what doesn’t.
During my thirty-plus years teaching high school English, I watched brilliant colleagues, exceptional students, and wise mentors navigate life with this same careful economy of effort. They weren’t lazy. Far from it. They just understood something that took me years to learn: intelligence isn’t just about what you know or how quickly you think. It’s equally about what you choose to ignore.
Here are 10 things they didn’t waste their precious energy on.
1. Trying to change people who don’t want to change
You know that colleague who complained about the same problem for fifteen years straight? I had several.
Every teachers’ lounge has them. Smart people figured out early what took me decades to understand: you can’t fix someone who isn’t looking for solutions.
I remember spending countless lunch breaks trying to help a fellow teacher who constantly griped about classroom management. I shared strategies, recommended books, offered to observe her classes. Nothing changed because she wasn’t actually seeking change. She wanted sympathy, not solutions.
The wisest teachers in our department? They listened politely for a minute, then redirected the conversation or excused themselves. They knew better than to pour energy into a bottomless well.
2. Dwelling on past mistakes
Here’s something I learned the hard way: admitting mistakes shows strength, not weakness. But there’s a difference between learning from errors and living in them.
Intelligent people acknowledge their missteps, extract the lesson, then move forward.
I once gave a student incorrect feedback on a major essay that affected her college application. When I realized my error weeks later, I was mortified. I apologized, wrote a glowing supplementary recommendation, and helped her revise. Then I had to let it go.
A mentor told me something that stuck: “The past is a reference book, not a residence.” Smart people check that book when needed, but they don’t set up camp there.
3. Proving themselves to everyone
When you’re secure in your abilities, you stop needing constant validation.
I watched this play out beautifully with our school’s most effective teachers. They didn’t interrupt meetings to showcase their knowledge or flood email chains with unnecessary contributions. They spoke when they had something valuable to add, and their silence carried as much weight as their words.
Meanwhile, I spent my first decade teaching trying to impress everyone. Parent conferences became performances. Staff meetings were opportunities to sound clever. Exhausting, really. The truly intelligent folks around me were too busy doing meaningful work to waste time on theatrical displays of competence.
4. Engaging with every argument
Remember when social media first exploded and suddenly everyone had opinions about everything? I watched brilliant friends get sucked into endless online debates about politics, parenting, even proper comma usage. But the smartest ones quickly learned to scroll past the bait.
They understood what I eventually figured out: not every hill is worth dying on. Sometimes the most intelligent response is no response at all. These days, when someone tries to pull me into a pointless argument, I think of my grandmother’s advice: “You don’t have to attend every argument you’re invited to.”
5. Maintaining toxic relationships out of obligation
Book clubs taught me this lesson as clearly as any classroom. You’d think literary discussions would be pure intellectual joy, right? Not always.
I noticed the same patterns of envy and gossip that plagued those teachers’ lounges for thirty years. Some members seemed to thrive on drama, turning every meeting into a subtle competition or complaint session.
The smartest members? They quietly found new book clubs or started their own. They didn’t make grand exits or burn bridges. They simply redirected their social energy toward relationships that actually nourished them.
Family obligations, old friendships, professional networks — intelligent people audit all of these regularly, keeping what serves them and gracefully releasing what doesn’t.
6. Perfectionism in everything
There’s a difference between excellence and perfectionism, and intelligent people know where to draw that line. They understand that making dinner doesn’t require the same precision as performing surgery. Not every email needs three rewrites.
I learned this after retiring. Suddenly, without grades to calculate or lessons to perfect, I had to recalibrate my standards. My volunteer work at the literacy center? That deserves my best effort. The arrangement of books on my shelf? Good enough is actually good enough.
Smart people know how to match their effort to the task’s true importance.
7. Worrying about things beyond their control
Weather, traffic, other people’s opinions, the past, aging — intelligent people acknowledge these realities without wasting precious mental energy fretting over them. They focus on their circle of influence, not their circle of concern.
A brilliant principal I worked under had a simple policy: “Control the controllables.” When standardized testing schedules disrupted our carefully planned units, she didn’t rage against the system. She adjusted what she could and accepted what she couldn’t. That’s wisdom in action.
8. Saying yes to everything
After retirement, everyone assumed I’d have endless time for committees, volunteer work, babysitting, and various causes. For a while, I fell into the trap. My calendar looked like a game of Tetris. Then I remembered watching the smartest teachers navigate similar requests. They had mastered the art of the gracious no.
These days, I practice saying no to activities that don’t genuinely enrich my life. It’s not selfish; it’s strategic. Every yes to one thing is a no to something else. Intelligent people understand this trade-off and choose accordingly.
9. Comparing themselves to others
Social comparison is quicksand for the mind. I saw this constantly in education. Teachers comparing test scores, salary steps, student feedback. The wise ones opted out of this game entirely. They measured progress against their own previous performance, not against their colleagues.
One teacher friend put it perfectly: “The only competition that matters is between who you were yesterday and who you are today.” She’s right. Intelligent people run their own race, at their own pace, toward their own finish line.
10. Holding grudges
Resentment is like carrying a backpack full of rocks that only you can feel. Intelligent people understand this burden isn’t worth the weight. They might not forget, but they choose to forgive — not for the other person’s benefit, but for their own peace of mind.
I had a department chair who undermined me early in my career. For years, I carried that anger. Then I noticed something: she’d moved on, probably forgotten all about it, while I was still hauling around this heavy grievance. The smart move? Setting down that backpack and walking away lighter.
Final thoughts
Looking back over decades of observing truly intelligent people, I see a pattern. They’re not just smart about acquiring knowledge or solving problems. They’re smart about energy management. They treat their mental and emotional resources like a wise investor treats money — carefully, strategically, never squandering it on ventures with no return.
The question isn’t whether you’re smart enough to understand these concepts. You are, or you wouldn’t have read this far. The question is whether you’re ready to stop wasting your energy on these ten things and redirect it toward what truly matters in your life.
Just launched: The Vessel’s Youtube Channel
Explore our first video: The Brain Beneath Our Feet — a short-film by shaman Rudá Iandê that challenges where we believe intelligence comes from.
Instead of looking to the stars or machines, Rudá invites us to consider that the first great mind on Earth may have existed without a brain at all… and that the oldest form of thought might be living beneath our feet.
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