手里有的/心里要的，加法/减法， 解决/解脱，能力/境界！40岁分界点
Happiness=what you have/what you want, to increase happiness you need to increase the numerator and decrease the denominator. the numerator is doing and the denominator is escaping. the numerator is by ability to handle and the denominator is by the level from a vision. Before you turn 40 years old, try to increase your numerator as much as possible. after 40, gradually decrease the denominator.