Halliday & Matthiessen (1999: 478):
In English, intentionality can be enacted within the interpersonal system of imperative modality (modulation) in the form of inclination, as in he won’t be ordered around (‘refuses to be’). It is independent of ideational agency; inclination is oriented towards the Subject, i.e. the modally responsible element of the clause, rather than (say) the Actor or Agent (as our passive example illustrates).