他说：“动机不良的人将永远存在。”

"People with poor motives will always exist," he says.

youdao

那时他对我太好了，我永远都还不清欠他的人情债。

He was so good to me that I can never repay the debt I owe him.

《柯林斯英汉双解大词典》

每个人都有愚蠢的时候，但没有一个永远愚蠢的人。

Everyone is a fool sometimes, but none is a fool forever.

youdao

Couldn't that be a kind of existence that would be forever enjoyable and yet it wouldn't be a rat-like existence?

那样的存在难道不是让人永远享受的,而且并非老鼠般的存在？

耶鲁公开课 - 死亡课程节选

Similarly, though, anybody who says, you should never think about the facts of mortality and the nature of death-- I think that's misguided as well.

但是同样地，任何人说，你应该永远不要想那些人必有一死,和死亡的事实-,我认为那也是有误导的。

耶鲁公开课 - 死亡课程节选

Whatever form the best regime takes however it will always favor a certain kind of human being with a certain set of character traits.

然而，无论最优的政体是采取那种型式,它都将会永远偏袒某一群人,且会有一些特定的性格特征。

耶鲁公开课 - 政治哲学导论课程节选