 While there have been numerous different replies along these lines (e.g., Lehrer 1980; Slote 1982; Watson 1986. See the entry on  arguments for incompatibilism  for a more extensive discussion of and bibliography for the Consequence Argument), the most influential of these objections is due to David Lewis (1981). Lewis contended that van Inwagen’s argument equivocated on ‘is able to break a law of nature’. We can distinguish two senses of ‘is able to break a law of nature’: