Disagreement is the soul of conversation — There is no conversation more boring than the one where everybody agrees.
Disagreement is important -- to have a person agree with everything you say is worse than living alone.
Disagreement is also important — we find comfort among those who agree with us, growth among those who don't.
Experience is important — You cannot, by all the lecturing in the world, enable a man to make a shoe.
15 concepts in this pillow book.