en_tn/job/09/01.md

I truly know that this is so

"I know that what you say is true"

this is so

Here the word "this" refers to what Bildad said.

how can a person be in the right with God?

"how can anyone be innocent before God?"

argue

"dispute"

he cannot answer him once in a thousand times

"Once in a thousand times" is an idiom that means "at all." Possible meanings are 1) "he cannot give any answer to God" or 2) "God will not answer him at all" (See: rc://en/ta/man/translate/figs-idiom)

a thousand times

"1,000 times"