To improve is to change; to be perfect is to change often.
欲求新,则求变。欲求完美,求常变。
"The past is a foreign country; they do things differently there."
Life is short, make it sweet.
蓬草长在麻地里，不用扶它也能挺立；把白沙放在黑土里，白沙也就变成黑的了。这两个例子说明，环境对一个人的影响，是非常大的，所以才有了《孟母三迁》的故事。