What Did Jesus Say About Hungering For Righteousness.?

And seeing the multitudes, Jesus went up into a mountain: and when He was set, His disciples came unto Him: And Jesus opened His mouth, and taught them, saying, Blessed are the poor in spirit: for theirs is the kingdom of heaven. Blessed are they that mourn: for they shall be comforted. Blessed are the meek: for they shall inherit the earth.Blessed are they which do hunger and thirst after righteousness: for they shall be filled.Matthew 5 vs 1-6.