When Simba being scolded because he had disobeyed his father...He said that he just want to be brave like his dad...then Mufasa said "i'm only brave when i have to be. Being brave doesn't mean you go looking for trouble."
"I guess even kings get scared,huh?" Simba asked.
Mufasa nodded gravely at the young cub.
One of my favorite quote from Lion King story in Disney Storybook Collection. You can find out about the book in here Disney Storybook Collection: A Treasury of Tales (Disney Storybook Collections)