en_tn_condensed/job/42/03.md

Who is this

The ULB and most modern versions agree that Job is loosely quoting God's own words from Job 38:2. You may decide, as does the UDB, to make it clear that God asked this question of Job and that Job is now remembering it. Alternate translation: "You said to me, 'Who is this" (See: rc://en/ta/man/translate/figs-rquestion)

conceals plans

That is, hides or misrepresents God's plans. (See: rc://en/ta/man/translate/figs-explicit)