At one point in the story, Ratty change his opinion significantly. What is it ?

Looking at chapter 9, Rat has sort of a mid-life crises. Rat sees other animals leaving for the winter and all of a sudden his sense of place and home is disturbed. If you love your home, then why would you ever leave it? Realizing he cannot get past Mole, Rat begins to cry. Mole puts him to bed, where he sobs for a while before growing quiet. Then, Mole talks about pleasant things - the weather and the harvest - and Rat slowly pulls himself from his depression. Capitalizing on Rat's changed mood, Mole gives him some paper and pen, so he can write poetry and hopefully feel better.