2. "Reciprocity is a deep instinct; it is the basic currency of social life."
- Jonathan Haidt, The Happiness Hypothesis: Finding Modern Truth in Ancient Wisdom
4. "What is life, except an ongoing instinct for survival? Nature uses that instinct to make us perform; otherwise we would all relax, and the species would disappear. Nature is a cruel green mother. The survival instinct is a goad, not a privilege."
- Piers Anthony, On A Pale Horse
6. "Beneath the instinct to fight there lurks a diviner instinct to love."
- Inazo Nitobe, Bushido: The Soul of Japan. A Classic Essay on Samurai Ethics
8. "I normally can't stand vice-free people. They conflate a narcissistic instinct for self-preservation with moral superiority. Plus they suck the life right out of a party."
- Dennis Lehane, Moonlight Mile
10. "Psychologists should bethink themselves before putting down the instinct of self-preservation as the cardinal instinct of an organic being. A living thing seeks above all to DISCHARGE its strength—life itself is WILL TO POWER; self-preservation is only one of the indirect and most frequent RESULTS thereof. In short, here, as everywhere else, let us beware of SUPERFLUOUS teleological principles!—one of which is the instinct of self-preservation (we owe it to Spinoza's inconsistency)."
- Friedrich Nietzsche, Beyond Good and Evil