volition
noun
vo·li·tion | \ vō-ˈli-shən , və-\
Definition of volition
1
: the power of choosing or determining
: WILL
2
: an act of making a choice or decision
also
: a choice or decision made
willing
adjective
will·ing | \ ˈwi-liŋ \
Definition of willing
1
: inclined or favorably disposed in mind
: READY
willing and eager to help
2
: prompt to act or respond
lending a willing hand
3
: done, borne, or accepted by choice or without reluctance
a willing sacrifice
4
: of or relating to the will or power of choosing
: VOLITIONAL
I guess if you ignore the first THREE definitions, you can squint sideways at the 4th, twist it a few times, and use it as a weak justification to remove the paladin's powers. You also have to ignore the definitions of volition, neither of which indicate willingness.