The work of Mark Sainsbury has made a significant and challenging contribution to several central areas of philosophy, especially philosophy of language and logic. He has made significant contributions to puzzles concerning the nature of thought and language and pioneered research in the philosophical theory known as fictionalism. In this outstanding volume, 20 contributors engage with Sainsbury’s work but also go beyond it, exploring fundamental problems in the philosophy of language, mind, and logic. Topics covered include propositional thought, intentionality, the mind-body problem, singular thoughts, the individuation of concepts, nominalisation, logical form, non-existent objects, and vagueness. Thought: Its Origin and Reach will be of interest to professional philosophers and students working in philosophy of mind, language, epistemology, and metaphysics.