A smart person always has a wrong eight-character idiom in many ideas.

It should be like this:

Even the wise are not always free from mistakes.

Source: Sima Qian's Biography of Historical Records and Huaiyin Hou in the Western Han Dynasty: "If I hear wisdom, I will lose it; A fool who worries too much will gain something. "

Meaning: No matter how clever a person is, after many considerations, individual mistakes will occur.