What are 3 quotations from the book To Kill a Mockingbird that show that Atticus Finch is a well-educated man?

I am writing a 5-paragraph essay on the book and one of my three points is that Atticus defies the 'stupid southerner' stereotype by being an intelligent, well-educated man. Since most of the things he says pertain to his being wise (another one of my points in the essay), I need help finding quotations from the book that show his education. Any help would be greatly appreciated!