What do mirrors and lamps in abrams mean?

This is a literary view, and there are roughly four theories in the book, namely, mirror is opposite to representative theories, and lamp is opposite to expression. There is a kind of "mirror thinking" in the western traditional thinking, and the lamp is biased towards the eastern Taoist thought. There must be a lamp in the heart of those who have the means. Whether it is a lamp or a mirror, what you want to explain is the significance and role of literature in reality. Know a little about yourself, hehe! I hope I can help you. )