I think that feelings and logic are of equal importance in a speech. I would say that feelings hold a bit more authority over facts in a speech because a good sense of emotion or connection with an audience goes farther than factual, dry logic. An audience will be more likely to remember or apply the contents of a speech in their lives if they feel a connection with it. If they are able to relate to the topics covered the information will have much stronger staying power. It is important to balance these out however, because too many feelings will lead to false information and a strictly emotional bond between a speaker and their audience. On the opposite side, a speaker relaying facts to their audience will not be able to hook the audience in and really give them the desire to listen. I think one will know when they cross that line whenever they see either extreme reaction from an audience. If the audience is crying in their seats and soaking up whatever the speaker tells them, the speech may be too emotional. However if an audience is having a hard time staying awake or looks uninterested, the speech may be too logical.
You make a very good point that feelings can lead to falsities. It is not exactly something that is secret or hard to see, but if forgotten can cause audiences to disengage.
Very good response for chapter 3. I think being able to find a healthy balance between feelings and logic is going to help make a good, credible, and listen-worthy speech. I like the vocabulary you used, it really drew me in.