““You've read Descartes," he remarked, every syllable edged in disbelief. ""I should like to hear your opinion on Cartesian dualism, then." Vivian thought for a long moment, inwardly relieved to discover that she understood the question. "I suppose you're referring to Mr. Descartes's theory that spirit and matter are separate entities? That we cannot rely on our senses as the basis of knowledge? I believe he is correct, and I think..." She paused and continued more slowly. "I think the truth is something you recognize with your heart, even when the evidence seems to prove otherwise.””