如果你不頑強，你就會過早放棄試驗。如果你不靈活，你就會以頭撞墻，而不會找到解決問題的不同辦法。
On pivoting: "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."
