Because most people are more emotional than logical, they tend to overreact to short-term results; they give up and sell low when times are bad and buy too high when times are good. I find this is just as true for relationships as it is for investmentswise people stick with sound fundamentals through the ups and downs, while flighty people react emotionally to how things feel, jumping into things when theyre hot and abandoning them when theyre not.

Principles by Ray Dalio