be dredged out

[laviniaque]

Hi;

In Artur Miller's All My Sons, there is an expression and because of this I don't quite understand what's meaning of the sentence.

"...When he reads, when he speaks, when he listens, it is with the terrible concentration of the uneducated man for whom there is still wonder in many commonly known things, a man whose judgements must be dredged out of experience and a peasant‐like common sense. A man among men."

Could you please tell me the meaning of "be dredged out?"

 

[teechar]

Could you please tell me the meaning of "be dredged out?"

No. You're misreading it.

a man whose judgements [must be] [dredged] [out of] experience and a peasant‐like common sense

must be = is very likely to be
dredged = extracted/scooped (here the author is using metaphor to express the roughness of the man's character)