Full Idea
A man is not at liberty to will or not to will, because he cannot forbear willing.
Gist of Idea
Men are not free to will, because they cannot help willing
Source
John Locke (Essay Conc Human Understanding (2nd Ed) [1694], 2.21.24)
Book Reference
Locke,John: 'Essay Concerning Human Understanding', ed/tr. Nidditch,P.H. [OUP 1979], p.246
A Reaction
Not quite an answer to the big problem, but an interesting observation for those who have high hopes of a truly, deeply and extensively free will.