Full Idea
Acting virtuously, in the way the virtuous agent acts, namely from virtue, is sufficient for being 'morally motivated' or acting 'from a sense of duty'.
Gist of Idea
Performing an act simply because it is virtuous is sufficient to be 'morally motivated' or 'dutiful'
Source
Rosalind Hursthouse (On Virtue Ethics [1999], Ch.7)
Book Reference
Hursthouse,Rosalind: 'On Virtue Ethics' [OUP 2001], p.141
A Reaction
Fine, but it invites the question of WHY virtue is motivating, just as one can ask this of maximum happiness, or duty, or even satisfaction of selfish desires.