'Acceptable' in the Bible

This is what the Lord says,“In a favorable time I have answered You,And in a day of salvation I have helped You;And I will keep watch over You and give You for a covenant of the people,To restore the land [from its present state of ruin] and to apportion and give as inheritances the deserted hereditary lands,

“Is a fast such as this what I have chosen, a day for a man to humble himself [with sorrow in his soul]?Is it only to bow down his head like a reedAnd to make sackcloth and ashes as a bed [pretending to have a repentant heart]?Do you call this a fast and a day pleasing to the Lord?

To proclaim the favorable year of the Lord,And the day of vengeance and retribution of our God,To comfort all who mourn,