Words are wise men's counters, they do but reckon by them; but they are the money of fools.
言语是智者的筹码,他们只是用它们来计算;但它们是愚人的金钱。
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.