两个物体的相互作用力总是大小相等,方向相反,同时出现或消失且作用于同一直线上。
悲伤不是线性的过程。它像波浪一样袭来,有时那些波浪会把你击倒。
The knowledge that you have emerged wiser and stronger from setbacks means that you are, ever after, secure in your ability to survive. You will never truly know yourself, or the strength of your relationships, until both have been tested by adversity. Such knowledge is a true gift, for all that it is painfully won, and it has been worth more than any qualification I ever earned.