Most people experience the ups and downs in life. Likely it is impossible not to but little seems known about its cause. People try to make their lives better. They try to feel happy. So what is it that takes them down, that makes them feel worse?
The mechanism is actually quite simple. You try to make your life better. You do in fact improve yourself. But there is someone else who is in your vicinity who wants you to go down, stay down. Now before you say that is impossible as it seems too simple, understand that this is a phenomenon that has been out of view of many for time immemorial.