So the Lord created our hearts.
He knows how much we can handle, what we like, what bothers us, and what gets us really giddy.
So the one who formed our inmost being says that We will be satisfied. He says we will be filled. He says that we can have the fullness of joy, and a peace that passes all understanding.
He formed us-so He knows what we have the ability of grasping...so that means these things are really within reach.
If we decide to seek Him out.