The Word of God will produce fruit just like rain on the ground

 ¹⁰ "The rain and snow come down from the heavens
     and stay on the ground to water the earth.
  They cause the grain to grow,
     producing seed for the farmer
     and bread for the hungry.
¹¹ It is the same with my word.
     I send it out, and it always produces fruit.
  It will accomplish all I want it to,
     and it will prosper everywhere I send it.

Isaiah 5