A venerable attempted solution to the problem of incompatible properties makes use of grammatical modifiers to index Christological predications to their respective natures: Christ is limited in knowledge qua his human nature, and omniscient qua his divine nature, where “qua” means “with respect to” or “in virtue of”. More simply: Christ qua human is limited in knowledge; Christ qua divine is omniscient. The thought of Thomas Aquinas furnishes a foundational source for this solution (Summa Theologiae 3.16.1–12; for broader discussion of patristic and medieval uses, see Cross 2002: 192–205). Thomas Senor forcefully argues that this grammatical solution does not work, for it cannot block the relevant entailment: since the one Christ really is human and really is divine, it follows that the one Christ is also limited in knowledge (qua human) and omniscient (qua divine), and so the contradiction remains (Senor 2002; see also Morris 1986).