3.10 did not return to me with her whole heart, but in pretense... I can understand a return with a divided heart but and curious what they hoped to gain with their pretense.
3.21 have forgotten their Lord... Not opposed Him, rebelled or sinned against Him, etc., just forgot Him. Living like there is not God is always a danger.
4.2 if you swear, "As the Lord lives," in truth...
4.3b break up the fallow ground... http://www.sermonindex.net/modules/articles/article_pdf.php?aid=579
4.22 They are 'wise'--in doing evil!... The wrong thing to be good at.