No mathematician is infallible;he may make mistakes,but he must not hedge.

没有一位数学家一贯正确的;他犯错误,但他绝不回避任何一个问题。

I must point that it’s unpractical without any mistakes.

我必须出不犯错误不现实的。

He is lifeless that is faultless.

有死人才不犯错误。

To err is human.

人都犯错误。

Adminisphere - The rarified organizational layers above the rank and file that makes decisions that are often profoundly inappropriate or irrelevant.

行政体/层，常犯错误的司决策层，应该司内握有实权却没有多少力的管理者。