RobH_en_tn/isa/40/14.md

From whom did he ever receive instruction?

This rhetorical question anticipates a negative answer and emphasizes that no one has ever done this. Alternate translation: "He has never received instruction from anyone." (See: rc://en/ta/man/translate/figs-rquestion)

Who taught him the correct way to do things, and taught him knowledge, or showed to him the way of understanding?

This rhetorical question anticipates a negative answer and emphasizes that no one has ever done these things. Alternate translation: "No one taught him the correct way to do things. No one taught him knowledge. No one showed to him the way of understanding." (See: rc://en/ta/man/translate/figs-rquestion)