▁he ▁finds ▁no ▁stop , ▁in ▁doing ▁what ▁he ▁has ▁the ▁will , ▁desire , ▁or ▁incl ination ▁to ▁do e ." ▁In ▁art icul ating ▁this ▁cru cial ▁prov iso , ▁David ▁H ume ▁writes , ▁" this ▁hypoth et ical ▁liberty ▁is ▁univers ally ▁allowed ▁to ▁belong ▁to ▁every ▁one ▁who ▁is ▁not ▁a ▁prisoner ▁and ▁in ▁ch ains ." ▁Similarly , ▁Vol taire , ▁in ▁his ▁D iction naire ▁philosoph ique , ▁claimed ▁that ▁" L iber ty ▁then ▁is ▁only ▁and ▁can ▁be ▁only ▁the ▁power ▁to ▁do ▁what ▁one ▁will ." ▁He ▁asked , ▁" w ould ▁you ▁have ▁everything ▁at ▁the ▁pleasure ▁of ▁a ▁million ▁blind ▁cap rices ?" ▁For ▁him , ▁free ▁will ▁or ▁liberty ▁is ▁" only ▁the ▁power ▁of ▁acting , ▁what ▁is ▁this ▁power ? ▁It ▁is ▁the ▁effect ▁of ▁the ▁constitution ▁and ▁present ▁state ▁of ▁our ▁org ans ." ▁ ▁Free ▁will ▁as ▁a ▁psych ological ▁state ▁Comp at ibil ism ▁often ▁regards ▁the ▁agent ▁free ▁as ▁virtue ▁of ▁their ▁reason . ▁Some ▁explan ations ▁of ▁free ▁will ▁focus ▁on ▁the ▁internal ▁caus ality ▁of ▁the ▁mind ▁with ▁respect ▁to ▁higher - order ▁brain ▁processing   – ▁the ▁interaction ▁between ▁conscious ▁and ▁un cons cious ▁brain ▁activity . ▁Like wise , ▁some ▁modern ▁compat ibil ists ▁in ▁psych ology ▁have ▁tried ▁to ▁rev ive ▁tradition ally ▁accepted ▁strugg les ▁of ▁free ▁will ▁with ▁the ▁formation ▁of ▁character . ▁Comp at ibil ist ▁free ▁will ▁has ▁also ▁been ▁attributed ▁to ▁our ▁natural ▁sense