'Discern' in the Bible

Then thy handmaid said, Let, I pray thee, the word of my lord the king be comfortable; for as an angel of God, so is my lord the king to discern good and bad: and Jehovah thy God be with thee.

I am this day fourscore years old: can I discern between good and bad? can thy servant taste what I eat or what I drink? can I hear any more the voice of singing men and singing women? wherefore then should thy servant be yet a burden unto my lord the king?