  It has been objected that these moral deceptionist definitions are unduly narrow and restrictive (Bok 1978). Surely, for example, it is possible to lie to a would-be murderer, whether it is impermissible, as some absolutist deontologists maintain (Augustine 1952; Aquinas 1972 (cf.  MacIntyre 1995b); Kant 1996 (cf. Mahon 2006); Newman 1880; Geach 1977; Betz 1985; Pruss 1999; Tollefsen 2014), or permissible (i.e., either optional or obligatory), as consequentialists and moderate deontologists maintain (Constant 1964; Mill 1863; Sidgwick 1981; Bok 1978; MacIntyre 1995a; cf. Kagan 1998).