“Serotonin, the "feel-good" brain chemical that is boosted by Prozac, depends on magnesium for its production and function.”

“That's what falling in love really amounted to, your brain on drugs. Adrenaline and dopamine, oxytocin and serotonin. Chemical insanity, celebrated by poets.”

“The act of laughing releases some nice chemical into your brain, you feel good and it's free.”

“Each happy chemical triggers a different good feeling. Dopamine produces the joy of finding what you seek– the “Eureka! I got it!” feeling. Endorphin produces the oblivion that masks pain– often called “euphoria.” Oxytocin produces the feeling of being safe with others– now called “bonding.” And serotonin produces the feeling of being respected by others–“pride.”

“Infatuation doesn't last because it's conditional and conditions change, but if it's real love, it turns into mature, unconditional love, and new chemicals are released in the brain, Endorphins that make you feel warm and peaceful and satisfied and content whenever you're with the one you love.... And miserable when you're without him because if he's not there, the brain won't produce chemicals.”

“There is an awful feeling of inevitability to life. Maybe this feeling is some proof of the existence of fate... or more likely it's simply the way our brains function that gives us this illusion. It's hard to say for certain.”