--- title: "Meaning & Key Takeaway of: Since survival is the sine qua non, I now…" description: "\"Since survival is the sine qua non, I now define the \"moral behavior\" as \"behavior that tends toward survival\".\" — Robert A. Heinlein" image: "https://sms4smile.com/quotes/i/d04/robert-a-heinlein-209_behavior_since-survival-is-the-sine-qua-non-i-now_1624643.jpg" --- # Since survival is the sine qua non, I now define the… ![“Since survival is the sine qua non, I now define the "moral behavior" as "behavior that tends toward survival".” quote by Robert A. Heinlein](https://sms4smile.com/quotes/i/d04/robert-a-heinlein-209_behavior_since-survival-is-the-sine-qua-non-i-now_1624643.jpg) [Download](https://sms4smile.com/quotes/i/d04/robert-a-heinlein-209_behavior_since-survival-is-the-sine-qua-non-i-now_1624643.jpg) [Open image](https://sms4smile.com/quotes/i/d04/robert-a-heinlein-209_behavior_since-survival-is-the-sine-qua-non-i-now_1624643.jpg) > “Since survival is the sine qua non, I now define the "moral behavior" as "behavior that tends toward survival".” [Robert A. Heinlein](https://sms4smile.com/quotes/author/robert-a-heinlein/) ## About This Quote This interpretation was drafted with AI assistance. It is one reading of the quote, not the author's own explanation. Moral behavior is defined as actions that promote survival, the fundamental necessity. **In simple terms:** Morality = survival‑oriented actions. Key Takeaway Prioritize survival‑supportive choices. Themes ethics survival philosophy Mood analytical critical Type philosophical ethical When to use this quote - risk assessment - resource management - health decisions Key Concepts evolutionary ethics pragmatic morality Questions to Reflect On - Is survival the only moral metric? - How to balance compassion? A Different Perspective Survival focus can ignore higher moral ideals. ★ ★ ★ ★ ★ No ratings yet [Behavior](https://sms4smile.com/quotes/about/behavior/) [Behavior Tends](https://sms4smile.com/quotes/about/behavior-tends-318607/) [Define Moral](https://sms4smile.com/quotes/about/define-moral-318606/) [Fiction](https://sms4smile.com/quotes/about/fiction/) [Habits](https://sms4smile.com/quotes/about/habits/) [Moral](https://sms4smile.com/quotes/about/moral/) [Moral behavior](https://sms4smile.com/quotes/about/moral-behavior/) [Morality](https://sms4smile.com/quotes/about/morality/) [Survival](https://sms4smile.com/quotes/about/survival/) ## Related quotes > [“Unusual behavior tends to produce estrangement in others which tends to further the unusual behavior and thus the estrangement in self-stoking cycles until some…](https://sms4smile.com/quotes/robert-pirsig/unusual-behavior-tends-to-produce-estrangement-in-others-which-tends/) [Robert Pirsig](https://sms4smile.com/quotes/author/robert-pirsig/) > [It is never easy to define what is moral, particularly in foreign policy. 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