John Gill Commentary Proverbs 31:12

"She doeth him good and not evil All the days of her life." — Proverbs 31:12 (ASV)

She will do him good, and not evil
Or, repay good to him, give him thanks for all the good things bestowed by him on her; will seek his interest, and promote his honour and glory to the uttermost; all the good works she does, which she is qualified for, and ready to perform, are all done in his name and strength, and with a view to his glory; nor will she do any evil willingly and knowingly against him, against his truths and ordinances; or that is detrimental to his honour, and prejudicial to his interest, (2 Corinthians 13:8) ;

all the days of her life ;
through which she desires to serve him in righteousness and true holiness; and to be steadfast and immovable, always abounding in his work, (Luke 1:74Luke 1:75) .