it would seem to me that emotions, such as fear, are an inferior, watered-down form of logic.
example: if you were walking down the street late at night and a large, dangerous looking person was following you turn for turn, you would feel afraid, regardless of the fact that the person has done nothing wrong. it's fairly obvious why you feel afraid... whether it be instincts or something from your past, your brain is releasing chemicals that make you think you are in danger, but statistically, there's a good chance nothing will happen to you.
here we can see how the connection between objective reality and feelings are shaky at best. pure logic, on the other hand, provides consistent results. in order to achieve this, logic requires self-imposed standards and limitations where information is inadequate. feelings says "this man wants to hurt me", logic says "this person is most likely just out for a walk, but may be inclined to hurt me as much as any other person i see, the fact that it's late at night doesnt necessarily make them any more or less a danger to me". feelings, based on logic past--either yours or your ancestors--are much more simplistic, so saying something for sure is easier.