A – Z · Reference

The self-development glossary.

Plain-English definitions of the ideas we cite most across 47 entries — no jargon, no fluff, no gurus. Named after the people who coined them, then explained like you're smart and tired.

47

defined terms

20

categories

20

letters covered

0

guru quotes

By desk

  • Branding
  • Communication
  • Creativity
  • Discipline
  • Entrepreneurship
  • Fitness
  • Focus
  • Habits
  • Leadership
  • Learning
  • Lifestyle
  • Mindset
  • Money
  • Parenting
  • Productivity
  • Purpose
  • Relationships
  • Sleep
  • Spirituality
  • Wellbeing
Anti-Goal
Mindset
A clearly named outcome you refuse to accept — often more motivating than the goal itself.
Atomic Habit
Habits
A tiny routine so small it feels almost embarrassing to skip — the smallest unit of behavior change.
Attachment Style
Relationships
Recurring pattern in how you seek closeness or distance in relationships — secure, anxious, avoidant, disorganized.
Beginner's Mind
Learning
Approaching a familiar subject with the openness of a novice; Zen concept adopted by learners and leaders.
Bright Line
Discipline
A rule with no exceptions — chosen precisely because ‘it depends' has failed you before.
Circadian Rhythm
Sleep
The roughly 24-hour internal clock that governs sleep, hormones, focus and appetite.
Cognitive Load
Focus
The total amount your working memory is holding at once — the invisible tax on every decision.
Compound Interest of Behavior
Habits
Small daily improvements accumulate into radically different long-term outcomes.
Deep Work
Productivity
Focused, undistracted cognitive effort on a demanding task, coined by Cal Newport.
Delayed Gratification
Discipline
Choosing a larger later reward over a smaller sooner one — the psychological engine of long-term outcomes.
Divergent Thinking
Creativity
Generating many possible solutions to a problem — the raw material of creativity.
Dopamine Fasting
Focus
A misused pop term for reducing high-stimulation inputs; useful in the narrow sense of restoring baseline pleasure sensitivity.
Eisenhower Matrix
Productivity
A 2×2 for triaging work by urgency and importance — attributed to Dwight D. Eisenhower.
FIRE
Money
Financial Independence, Retire Early — a movement built on high savings and lean living.
Flow State
Wellbeing
The state of full absorption in an activity that matches skill to challenge, coined by Mihaly Csikszentmihalyi.
Framework
Mindset
A named structure for thinking about a class of problems — portable across contexts, unlike a personal opinion.
Growth Mindset
Mindset
Belief that abilities can be developed through effort, coined by Carol Dweck.
Habit Stacking
Habits
Attaching a new tiny behavior to an already established one — a cue-piggyback strategy from BJ Fogg and James Clear.
Hedonic Treadmill
Wellbeing
The tendency to return to a stable level of happiness despite gains — hence why the next promotion feels smaller than expected.
Identity-Based Habits
Habits
Change built on the sentence ‘I am the kind of person who…' rather than on outcomes.
Ikigai
Purpose
Japanese concept of the reason for being — the intersection of what you love, what you're good at, what the world needs and what pays.
Implementation Intention
Discipline
A pre-committed ‘if X, then I will Y' plan — one of the most robust findings in behavior science.
Kaizen
Mindset
Japanese philosophy of continuous, incremental improvement.
Locus of Control
Mindset
The degree to which you believe you influence outcomes in your life vs. external forces.
Memento Mori
Spirituality
Latin: ‘remember you must die'. A Stoic reminder used to clarify priorities and dissolve pettiness.
Metacognition
Learning
Thinking about your own thinking — the skill that makes every other skill improvable.
Negative Visualization
Spirituality
Stoic practice of imagining losing what you have, in order to appreciate it now.
Non-Sleep Deep Rest
Sleep
NSDR — a short, guided body-scan protocol popularized by Andrew Huberman for recovery and focus.
Overton Window
Communication
The range of ideas considered mainstream at a given moment — quietly shifts what feels ‘reasonable' to want.
Pareto Principle
Productivity
The 80/20 rule — roughly 80% of results come from 20% of causes.
Personal Brand
Branding
The public perception of your professional identity, shaped deliberately over time.
Pomodoro
Productivity
A 25-minute focused work sprint followed by a 5-minute break, invented by Francesco Cirillo.
Positive Discipline
Parenting
A parenting approach that is firm and kind — teaching skills instead of punishing.
Product-Market Fit
Entrepreneurship
The moment your product finally satisfies a strong market demand.
Progressive Overload
Fitness
The training principle of gradually increasing load to force adaptation — applies to muscles and to skills.
Psychological Safety
Leadership
A team norm where members feel safe taking interpersonal risks — the biggest predictor of team performance in Google's Project Aristotle.
Radical Candor
Communication
Kim Scott's model for feedback: care personally, challenge directly.
Sabbatical
Lifestyle
An intentional pause from work — a month, quarter or year — used for rest, learning or reinvention.
Second Brain
Learning
An external system for capturing ideas so your first brain can think, popularized by Tiago Forte.
Servant Leadership
Leadership
A leadership philosophy where the primary role is to serve the team, coined by Robert Greenleaf.
Sleep Hygiene
Sleep
The set of behaviors that make consistent, restorative sleep more likely.
Spaced Repetition
Learning
Reviewing material at expanding intervals — the most efficient way to move facts into long-term memory.
Stoicism
Mindset
Ancient philosophy of virtue and equanimity focused on what you can control.
Sunk Cost Fallacy
Mindset
Continuing an effort because of past investment rather than expected future value.
Time Blocking
Productivity
Assigning specific hours to specific work in advance instead of reacting to a to-do list.
Wabi-Sabi
Spirituality
Japanese aesthetic that finds beauty in imperfection, impermanence and incompleteness.
Zone 2 Cardio
Fitness
Sustained low-intensity aerobic training at a pace where you can still hold a conversation — the mitochondrial base of endurance.

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If you'd add an entry, reply to any Sunday letter. We update this shelf monthly.