To hunger and thirst.

The words "hunger and thirst" mean to "continually hunger and thirst". The word "righteousness" here means "God’s divine order". Wuest refers the word "filled" as meaning "filled as to be completely satisfied". When you join this scripture to John 6:33 where Jesus says to "seek the Kingdom of God and His righteousness, and all these things will be added to you", You get a picture of a person who is constantly seeking God’s perfect will for their life, and the promise is that when they choose to go God’s way, they will find out that they are more satisfied than if they had gone their own way. (I have found this out through the "school of hard knocks".)