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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.

There is no stress in the world, only people thinking stressful thoughts.

譯文：家境縱然貧寒，也要讓孩子讀書學習；人即使飛黃騰達了，也不能忘記耕種勞作的艱辛。賞析：積金千兩，不如明解經書。有田不耕倉廩虛，有書不讀子孫愚。從古至今，無數的先賢都在告訴我們，讀書是有很多好處的。貧窮不忘恩，富貴不忘本。

唯一的失敗就是不去嘗試。

A leader's vision must be clear enough to guide but flexible enough to adapt.