Full Idea
If wanting something most were the same as having the most powerful feelings about it, then as an ascetic (rejecting what you most powerfully desire), your wanting most to eat a bun would be your reason for not eating the bun.
Gist of Idea
For an ascetic a powerful desire for something is a reason not to implement it
Source
Rowland Stout (Action [2005], 3 'The belief-')
Book Reference
Stout,Rowland: 'Action' [Acumen 2005], p.36
A Reaction
This sounds like reason overruling desire, but the asceticism can always be characterised as a meta-desire.