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')
Book Reference
Stout,Rowland: 'Action' [Acumen 2005], p.125
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.