"The happiness of your life depends upon the quality of your thoughts; therefore guard accordingly"
About this Quote
The sentence works because it’s both intimate and militarized. “Guard accordingly” turns mental life into a perimeter to patrol. That’s the subtext: your mind is porous, constantly breached by insult, fear, status-hunger, fantasy, grievance. Aurelius implies that “happiness” isn’t a prize you stumble into; it’s a byproduct of vigilance. He’s also smuggling in a moral claim: you are responsible for the inner climate you create. Not for what happens to you, but for the stories you let set up camp.
Context matters: Meditations was private writing, closer to a commander’s notebook than public philosophy. The lack of ornament is the point. This is self-command from a soldier-emperor who knows that morale collapses long before walls do. In modern terms, he’s warning that your feed, your resentments, your spirals aren’t “just thoughts.” They’re the architecture of your days.
Quote Details
| Topic | Happiness |
|---|---|
| Source | Marcus Aurelius, Meditations (2nd century CE). Famous line found in many English translations of Meditations. |
| Cite |
Citation Formats
APA Style (7th ed.)
Aurelius, Marcus. (2026, January 15). The happiness of your life depends upon the quality of your thoughts; therefore guard accordingly. FixQuotes. https://fixquotes.com/quotes/the-happiness-of-your-life-depends-upon-the-171394/
Chicago Style
Aurelius, Marcus. "The happiness of your life depends upon the quality of your thoughts; therefore guard accordingly." FixQuotes. January 15, 2026. https://fixquotes.com/quotes/the-happiness-of-your-life-depends-upon-the-171394/.
MLA Style (9th ed.)
"The happiness of your life depends upon the quality of your thoughts; therefore guard accordingly." FixQuotes, 15 Jan. 2026, https://fixquotes.com/quotes/the-happiness-of-your-life-depends-upon-the-171394/. Accessed 6 Feb. 2026.












