Read the story below. "The Small Oak Tree" Little Acorn sprouted in the middle of a big green meadow. All around him stood tall, ancient oak trees with thick branches and leafy crowns. Little Acorn looked up and sighed, "I wish I were big and strong like the old oaks right now!" Grandpa Oak looked down and smiled softly. "Patience, little one," he said. "Every giant oak was once a tiny acorn like you. Growth takes time, sunshine, and plenty of rain." Little Acorn decided to enjoy each day. He stretched his leaves toward the morning sun and drank up the fresh raindrops. Summer turned into autumn, and autumn turned into winter. Year after year, Little Acorn grew taller and stronger. One afternoon, a little squirrel sat in his shade. Little Acorn realized he was now a strong, shady tree. What is the main moral or central message of the story?