Speaking on 'understanding', based on what Bro Eli said it is even more evident that without understanding, no man (flesh) can give meaning or comprehend the word. Irrespective of how many times one listens, because even while Jesus Christ was alive the disciples couldn't give meaning to any of the parables neither could they even understand their purpose (journey with Christ). Not just because he needed companionship but because he needs a protege which will bare witness to and wrought greater works than he (Jesus)... But after his persecution, death, resurrection yet only minutes before his ascension did he opened the eyes of their understanding.
Luke 24:45 Then opened he their understanding, that they might understand the scriptures