It is difficult to predict the future but foolish to ignore the past.

虽然很难去预测未来，但忽略过去却一定是愚蠢的。

youdao

Better a poor but wise youth than an old but foolish king who no longer knows how to take warning.

贫穷而有聪明的少年人，胜过年老不肯纳谏的愚昧王。

youdao

Let's see how smart you are: wise people save for the future, but foolish people spend whatever they get.

让我们看看你到底有多聪明：聪明的人总是为未来进行储蓄，愚蠢的人却花光他们的所有。

youdao

These conditions did not arise as a result of market forces, but from foolish monetary, fiscal, and regulatory policies that distorted market forces.

FORBES: Further Fed Easing Writes The Dollar's Epitaph

Following his heart as he did was foolish but it happens.

NPR: Ex-SC Gov. Sanford Back In Political Office

But it would be foolish to underestimate the value that can be seeded from a hacking session.

FORBES: Hack Four: Prototype a Kickstarter Project