'Discern' in the Bible

Then your maidservant said, ‘Please let the word of my lord the king be comforting, for my lord the king is as the angel of God to discern good and evil. May the Lord your God be with you.’”

I am this day eighty years old. Can I [be useful to advise you to] discern between good and bad? Can your servant taste what I eat or drink? Can I still hear the voices of singing men and women? Why then should your servant be an added burden to my lord the king?