Happiness doesn’t depend on any external conditions, it is governed by our mental attitude. 幸福不是取决于外界环境，它由我们的心态来决定。 ——戴尔卡耐基（Dale Carnegie）

Heard that it is very easy to be happy, as could be diluted with time going on.————听说幸福很简单。简单到时间一冲就冲淡。