A book is not just a collection of words, it is a perception portrayed on blank sheets. You know, getting you the feelings of blowing winds and rains and sun and flowers around, the smiles, the tears, the notional links with the characters and make them all alive, while you read. And that's sure as hell a gruelling task !
In art, and maybe just in general, the idea is to be able to be really comfortable with contradictory ideas. In other words, wisdom might be, seem to be, two contradictory ideas both expressed at their highest level and just let to sit in the same cage sort of, vibrating. So, I think as a writer, I'm really never sure of what I really believe.