Appendix A: On the Words “Spirit” and “Spiritual”

Big idea

Summary

In this appendix Lewis takes up a linguistic and philosophical confusion he thinks quietly distorts a great deal of popular religious thinking: the assumption, absorbed more from a general cultural mood than from careful reflection, that calling something 'spiritual' means it is thin, vague, ghostly, or only faintly real, in contrast to solid, definite, fully real 'matter.' On this common but mistaken picture, spirit is treated as a kind of watered-down, less substantial version of the physical.

Lewis argues this gets Christian metaphysics exactly backwards. In classical Christian thought, spirit is not less real or less substantial than matter; if anything, it is more so, since spirit (supremely, God himself) is the self-existent reality on which all merely material, dependent existence rests. Calling God 'a spirit' is not a way of saying he is a wispy, half-existent presence; it is a way of saying he is fully, actively, concretely real in a way that goes beyond, rather than falling short of, ordinary physical solidity.

This confusion matters, Lewis suggests, because it quietly shapes how people imagine miracles, the afterlife, and spiritual experience generally — leading many to picture 'spiritual' realities as necessarily dim, abstract, and unimpressive, when a more careful use of the word would suggest exactly the opposite: something more vividly, forcefully, and permanently real than the physical world we currently take to be the standard of solidity.

Key points

• Popular usage often treats 'spiritual' as meaning thin, vague, or less real, in implicit contrast to solid, definite 'material' reality.
• Classical Christian thought reverses this: spirit (supremely God) is more fully and concretely real than matter, not less, since matter's existence depends on it.
• This confusion affects how people imagine miracles, heaven, and spiritual experience, often picturing them as dim and abstract when the Christian claim is closer to the opposite.

Illustrations & analogies

• The everyday habit of calling something 'merely spiritual' as a way of downgrading it is used throughout to expose how deeply the mistaken assumption has settled into ordinary language.

For reflection and discussion

1. Had you, before reading this appendix, tended to think of 'spiritual' things as less solid or less real than physical things? Where might that habit of thinking have come from?
2. How might picturing spirit as more real, rather than less real, than matter change the way you imagine heaven, angels, or God's own nature?