My read:

1. Emotion has no biological marker, which refute the idea of mechanical connection between brain (and other body parts) to emotion

2. Reasoning, by general feeling, is a mental process carried out by brain primarily, but has a seemingly much stronger connection to biological signals

3. What I was inferring from the theory of constructive emotion, is that emotion really is a form of higher level reasoning. It's higher than the typical reasoning, so that it's connection with biological signals are extenuated and more indirect

I don't remember the words of the book.

This connection between reasoning and emotion is primarily my own rudimentary idea. Can be seen as an expolation of the theory.