You can read other people like a book today. What were once the vague undercurrents of their true feelings will be blatant and obvious to you. This insight on what motivates people is extremely useful for you, especially if you're working through a negotiation. You're going to understand exactly what you need to say to get what you want. But don't feel guilty. This isn't some kind of evil manipulation. You'll create a win/win situation for everyone.