serotonin, dopamine, oxytocin and endorphins

“Nothing captures the biological argument better than the famous New Age slogan: ‘Happiness begins within.’ Money, social status, plastic surgery, beautiful houses, powerful positions – none of these will bring you happiness. Lasting happiness comes only from serotonin, dopamine and oxytocin.”
― Yuval Noah Harari, Sapiens: A Brief History of Humankind 

• Dopamine: Known as the “feel-good” hormone, dopamine is a neurotransmitter that’s an important part of your brain’s reward system. It’s associated with pleasurable sensations, along with learning, memory, and more.
• Serotonin: This hormone and neurotransmitter helps regulate your mood as well as your sleep, appetite, digestion, learning ability, and memory.
• Oxytocin: Often called the “love hormone,” oxytocin is essential for childbirth, breastfeeding, and strong parent-child bonding. It can also help promote trust, empathy, and bonding in relationships. Levels generally increase with physical affection.
• Endorphins: These hormones are your body’s natural pain reliever, which your body produces in response to stress or discomfort. Levels may also increase when you engage in reward-producing activities such as eating, working out, or having sex. https://www.healthline.com/health/happy-hormone