Blessed is the divine happiness of God, its a quality of God himself.
He shares his divine happiness with those he saves through regeneration, making them like himself.
Psalm 72:18 Blessed be the LORD, the God of Israel, who alone does wondrous things.
Psalm 66:20 Blessed be God, because he has not rejected my prayer or removed his steadfast love from me!
People can only have this Happiness of God by being “born again” because natural man is spiritually dead. So the Beatitudes describe the attitude and divine happiness that God gives when he saves someone. Natural man has a different nature (sin) which is why they cannot experience true divine happiness.