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The only thing I'm sure of is that I know nothing.

文學是在非人的世界中保持我們人性的火焰。

I believe that poetry is a way to express the inexpressible.

In chemicals, our greatest challenge is also our greatest opportunity: meeting global needs while protecting the planet.

人在談論自己時最不像自己。給他一個面具，他就會告訴你真相。