The Question and Answer section for The Wind in the Willows is a great resource to ask questions, find answers, and discuss the novel.
The mole learns that adventure is a good thing, he learns that it is enjoyable to come out of your shell..... to explore. He learns that he is brave, he learns that it isn't always good to be impetuous. Most of all, he learns the importance of...
Over the course of the novel, Mole learns the value of adventure. He learns the value of self-reliance and finds the courage within himself.
There are actually two answers to this question. One, commonly used words were different in the early 1900s, when this book was written. Second, words like this expand the vocabulary.... they're educational.