如果你不顽强,你就会过早放弃试验。如果你不灵活,你就会以头撞墙,而不会找到解决问题的不同办法。
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."