Full Idea
Weakness of will is a threat to the outward-looking approach to agency. It seems you can hold one thing to be the thing to do, and at the same time do something else. Many regard this as a decisive reason to follow a more inward-looking approach.
Gist of Idea
If you can judge one act as best, then do another, this supports an inward-looking view of agency
Source
Rowland Stout (Action [2005], 8 'Weakness')
A Reaction
It hadn't struck me before that weakness of will is a tool for developing an accurate account of what is involved in normal agency. Some facts that guide action are internal to the agent, such as greed for sugary cakes.
Book Reference
Stout,Rowland: 'Action' [Acumen 2005], p.125