I change my mind about the problem of free will every time I think about it, and therefore cannot offer any view with even moderate confidence; but my present opinion is that nothing that might be a solution has yet been described. This is not a case where there are several possible candidate solutions and we don’t know which is correct. It is a case where nothing believable has (to my knowledge) been proposed by anyone in the extensive public discussion of the subject.

Thomas Nagel, A View from Nowhere, New York, 1986, p. 112