I have heard the check of my reproach. — Rather, I have heard, or, I hear the reproof of my shame: that is, a reproof that puts me to shame, or is intended to do so.
The spirit of my understanding causeth me to answer. — Or, more literally, Out of my understanding my spirit answereth me, or causeth me to answer. He professes to be moved by an impulse within, which he cannot but obey.