Look upon me - View me; consider my circumstances; compare my words; and you must be convinced that I have spoken nothing but truth.
Now, therefore, be content - Rosenmuller has better rendered this, “if it please you.” The sense is, “if you are willing, look upon me.” That is, “if you are disposed, you may take a careful view of me. Look me in the countenance. You can see for yourselves whether I am sincere or false. I am willing that my whole demeanor should be subjected to the utmost scrutiny.”
For it is evident unto you if I lie - Margin, as in Hebrew before your face. That is, “you yourselves can see by my whole demeanor, by my sufferings, my patience, my manifest sincerity, that I am not playing the hypocrite.” Conscious of sincerity, he believed that if they would look upon him, they would be convinced that he was a sincere and an upright man.