Utilitarianism is simple. Whatever action creates the most happiness for the most people is the right thing to do. That’s it. Jeremy Bentham came up with this in the 1700s. He called it “the greatest happiness for the greatest number.” John Stuart Mill refined it later. The math is straightforward. Count up all the pleasure an action creates. Count up all the pain. Subtract pain from pleasure. The action with the highest score wins....
Determinism is simple. Everything that happens was caused by something that happened before it. The coffee cup falls because you knocked it. You knocked it because you reached for your phone. You reached for your phone because it buzzed. It buzzed because someone texted you. Go back far enough and you get to the Big Bang. Every event since then has been one long chain of cause and effect. Including your brain states....
Most people ask “What is the meaning of life?” like there’s a hidden answer waiting somewhere. Philosophy has bad news: there probably isn’t one. At least not the kind you’re looking for. No cosmic purpose written into the universe. No instruction manual. No predetermined reason you exist. This sounds depressing. It’s actually liberating. Think about it this way. If life had one true meaning — handed down by God or built into nature — you’d have no choice about it....
A runaway trolley speeds toward five people tied to the tracks. You can pull a lever to divert it onto a side track, where it will kill one person instead of five. Do you pull the lever? Most people say yes. Save five lives by sacrificing one. The math seems obvious. But here’s the twist. Same setup, except this time you’re on a bridge above the tracks with a large stranger....
Nihilism gets a bad reputation. People hear “life has no meaning” and picture someone in a black hoodie saying nothing matters while staring at the void. That’s not what nihilism actually claims. Nihilism says life has no inherent meaning. No cosmic purpose handed down from above. No predetermined plan you’re supposed to follow. The universe didn’t create you for a reason. But nihilists don’t stop there. Most of them ask: so what now?...
Existentialism says you exist first, then you decide what you are. Most philosophies work backward. They start with human nature, then tell you how to live. “Humans are rational, so be rational.” “Humans have souls, so save your soul.” Existentialists flip this. You’re born without a preset nature or purpose. No cosmic plan. No essential self to discover. Just raw existence. This sounds terrifying. It’s meant to. Sartre called it “being condemned to be free....
Most people hear “hedonism” and think of someone doing shots at 2 AM or buying things they can’t afford. That’s not hedonism. That’s just poor impulse control. Real hedonism is a philosophy. It says pleasure is the only thing that’s good for its own sake. Pain is bad. Everything else—money, fame, virtue—only matters if it leads to pleasure or prevents pain. This sounds obvious until you watch people chase things that make them miserable....
Stoicism gets a bad rap. People think it means being emotionless. A robot. It doesn’t. The Stoics had a simple insight: most of your suffering comes from wanting to control things you can’t control. Your boss is unreasonable. Traffic is terrible. Your team lost. Someone said something cruel about you online. None of that is up to you. What is up to you? How you respond. What you do next. Where you put your attention....
We’ve made wanting things into a moral failing. Want a nicer car? You’re materialistic. Want recognition at work? You’re vain. Want your ex back? You’re pathetic. Want to be rich? You’re shallow. But here’s what I notice: the people who shame desire the most still want things. They just want different things. The monk who’s renounced material possessions? He wants enlightenment. The minimalist who owns twelve items? She wants simplicity. The stoic who claims to be above it all?...
We call some pleasures “guilty” and others virtuous. Eating cake versus eating kale. Watching reality TV versus reading books. Sleeping in versus getting up early. This distinction isn’t natural. Pleasure is pleasure. But calling some pleasures guilty serves a purpose. It creates social order. If everyone chased immediate physical pleasures all the time, society would fall apart. So we developed shame around certain kinds of enjoyment. We made indulgence feel wrong and discipline feel righteous....