我最好的年华是在50岁之后。年龄只是一个数字——重要的是你的态度。
I’ve had my best years after fifty. Age is just a number—it’s your attitude that counts. 
We don’t inherit the earth from our ancestors; we borrow it from our children.
阈限性是两个阶段之间的过渡状态,个体既不属于这里也不属于那里,处于两者之间。