Eudaimonia is Aristotle's term for the highest human good, usually translated as "happiness" but much closer to "flourishing."

A parasocial relationship is a one-sided bond in which a person feels close to someone who isn’t as connected (or connected at all) in return.

Memento Mori is Latin for "remember that you must die."

The Bamboo Principle takes its name from moso bamboo, which spends its first several years producing almost nothing above ground.

A Gestalt Switch is the moment when the same information suddenly reorganizes into an entirely different picture.

Act As If is the practice of behaving as though something is already true in order to help make it true.

Cognitive Load theory describes the limited capacity of human working memory.

Asymmetric Risk describes a bet where the potential downside and potential upside are wildly unequal.

Anagnorisis is the Greek term for the moment of critical discovery.

Love Languages is a framework proposing that people give and receive love in five primary ways.

The Map is Not the Territory is a principle reminding us that our representations of reality are not the same as reality itself.

The Endowment Effect is the psychological tendency to overvalue things simply because you own them.

A Ulysses Pact is a decision made in a clear-headed state that deliberately binds your future self against a predictable moment of weakness.

The Spillover Effect describes the phenomenon where behavior, emotion, or performance in one area of life bleeds—uninvited—into another.

Supercompensation is the physiological principle that the body doesn't just recover from stress, it recovers past its previous baseline.

Episodic Friendship is the recognition that not all meaningful relationships are meant to be continuous.

Temptation Bundling is the practice of pairing something you need to do but resist with something you genuinely enjoy.

Satori is a Zen Buddhist term for a sudden flash of awakening—a moment in which something is understood not gradually, but all at once.

The Sapir-Whorf Hypothesis proposes that the language you speak shapes your reality.

Akrasia is the ancient Greek term for acting against your own better judgment—doing the thing you know you shouldn't, or failing to do the thing you know you should.