simply because you need people to exchange the knowledge that each of you upholds.If you have to read books then share what you gain to get more of what you are unaware of.A word spoken by another person is easy to remember than filling your mind with alot of readings that you can't remember.
I remember watching the inauguration on TV. The sun was so bright that Robert Frost had trouble seeing his copy of the poem, and ended up reciting the poem from memory.
