"Blessed are those who hunger and thirst for righteousness for they shall be filled."
Matthew 5:6

This verse speaks to those who have a deep-seated desire for God's righteousness to be displayed in their lives-- those whose hunger can only be met by the "Bread of Life", and whose thirst is only quenched by the "Living Water". An excellent example of this type of person would be the woman at the well in John 4. Her spirit was parched and panting for something real. It was a Desire she had tried to satisfy in her flesh, but was only left battered. empty, and still thirsting for more. Jesus gave her Living Water (Himself) that she might never thirst again. In the presence of Jesus she was fulfilled.

Do not work for food that spoils, but for food that endures to Eternal life, which the Son of Man will give you.  John 6:27

Someone who hungers after righteousness realizes that real, lasting satisfaction cannot be found in the temporal things that the world has to offer, but in the eternal goodness of God. They seek after Him with all their heart and can't be satisfied with less than all of God in their lives.

Then Jesus declared, “I am the bread of life. Whoever comes to me will never go Hungry, and whoever believes in me will never be thirsty.  John 6:35

Jesus is the sustenance our hearts crave. He is the answer to every search, every quest, every desire. The pleasures and comforts of this world can only satisfy for the moment, then leave us wanting more, but His love and acceptance is the satisfaction of our hunger and thirst for more than life can afford.  His peace is everlasting and eternal. He is all that can quench the insatiable cravings that sometimes threaten to consume us.

You open your hand and satisfy the desires of every living thing.  Psalm 145:16

Jesus is the answer to every longing we have. His provision is the answer to our prayers. He feeds the hungry heart and offers relief to a parched soul.

Let them give thanks to the Lord for his unfailing love and his wonderful deeds for mankind, for he satisfies the thirsty and fills the hungry with good things.  Psalm 107:8-9