Jeremiah bought a field as a sign of his faith in the future of Isreal. By what "investments" can you demonstrate practical faith in God's kingdom?

“‘So do not be afraid, Jacob my servant;
    do not be dismayed, Israel,’
declares the Lord.
‘I will surely save you out of a distant place,
    your descendants from the land of their exile.
Jacob will again have peace and security,
    and no one will make him afraid.

~Jeremiah 30:10