The Oak Inside the Acorn by Max Lucado
Little Acorn sees himself as very small and he's unsure of what he's supposed to do in life. Eventually, he grows into Big Oak, but he still wonders about his purpose. Though he tries as hard as he can, he can't grow oranges like his friends the orange trees, or produce beautiful flowers like his friends Pink Petunia or Rosie. But finally, he discovers that his mighty branches were created for a very special purpose! Recommended for ages 5 to 10.