Metaphysics deals with truth, existence and goodness; it also considers change, time and causation, which characterise the physical world, and thought and language. We are familiar with all these things, but when we try to say what they are we become tongue-tied.

William Charlton draws a line between lexicography, which lists words, and grammar, which specifies constructions for various forms of speech. Both words and constructions have meaning, but in different ways, and he argues that the topics of metaphysics are expressed primarily by constructions. He surveys the history of...

In On The Soul 2.1-6, Aristotle differs from Plato in his account of the soul, by tying it to the body. The soul is the life-manifesting capacities that we all have and that distinguish living things, and explain their behaviour. He defines soul and life by reference to the capacities for using food to maintain structure and reproduce, for perceiving and desiring, and for rational thought. Capacities have to be defined by reference to the objects to which they are directed. The five senses, for example, are defined by reference to their objects which are primarily forms like colour....

In this, one of the most original ancient texts on sense perception, Philoponus, the sixth century AD commentator on Aristotle, considers how far perceptual processes are incorporeal. Colour affects us in the same way as light which, passing through a stained glass window, affects the air, but colours only the masonry beyond. Sounds and smells are somewhat more physical, travelling most of the way to us with a moving block of air, but not quite all the way. Only the organ of touch takes on the tangible qualities perceived, because reception of sensible qualities in perception is cognitive,...

Metaphysics deals with truth, existence and goodness; it also considers change, time and causation, which characterise the physical world, and thought and language. We are familiar with all these things, but when we try to say what they are we become tongue-tied.

William Charlton draws a line between lexicography, which lists words, and grammar, which specifies constructions for various forms of speech. Both words and constructions have meaning, but in different ways, and he argues that the topics of metaphysics are expressed primarily by constructions. He surveys the history of...