People who stubbornly refuse to understand what God is saying or doing are spoken of as if their heart is dull. Here "heart" is a metonym for the mind. (See: [[rc://en/ta/man/translate/figs-metaphor]] and [[rc://en/ta/man/translate/figs-metonymy]])
People who stubbornly refuse to understand what God is saying or doing are spoken of as if they are unable to hear and are shutting their eyes so that they will not see. (See: [[rc://en/ta/man/translate/figs-metaphor]])