释义：天下万物的存在与否，不是人的思考、忧虑所能使其产生或消失的。

有一种鸟儿是永远也关不住的，因为它们的每片羽毛都闪烁着自由的光辉。

If you're not stubborn, you'll give up on experiments too soon. And if you're not flexible, you'll pound your head against the wall and you won't see a different solution to a problem you're trying to solve.

生活中最重要的不是征服，而是要战斗得好。