In Isaiah 55.10, God describes the regular, natural process of rain watering the earth and causing growth that brings “seed to the sower and bread to the eater.”  The work of the Word of God is likened to that process in verse 11.  God’s word will

–          Go out from His mouth

–          Shall not return to God empty

–          Shall accomplish that which God purposes

–          Shall succeed in the things for which God sent it.

Just as with prayer, there is a mystery here.  We can’t know the details of all God’s purposes and the things for which he sends His Word.  But, we can trust Him that He is working all things together for our good (Romans 8.28) and that His Word never returns empty. That’s powerful work.