Full Idea
Aristotle's discussion of akrasia seems to leave the vital point unexplained, which is why the better syllogism is overcome.
Clarification
'Akratic' actions are those which lack self-control
Gist of Idea
Aristotle seems not to explain why the better syllogism is overcome in akratic actions
Source
comment on Aristotle (Nicomachean Ethics [c.334 BCE], 1102b14) by Myles F. Burnyeat - Aristotle on Learning to be Good p.85
Book Reference
'Essays on Aristotle's Ethics', ed/tr. Rorty,Amélie Oksenberg [University of California 1980], p.85
A Reaction
The problem is where exactly the action originates within us - is it sometimes from deliberation, and sometimes from some irrational force? Either akrasia is easy and action baffling, or vice versa.