Friends hold a mirror up to each other; through that mirror they can see each other in ways that would not otherwise be accessible to them, and it is this mirroring that helps them improve themselves as persons.
The 19thc hatred of Realism is Caliban's enraged reaction to seeing his own face in the mirror. The 19thc rejection of Romanticism is Caliban's fury at not seeing his face reflected in the mirror.
"The love of God, unutterable and perfect, flows into a pure soul the way light rushes into a transparent object. The more love that it finds, the more it gives itself: so that, as we grow clear and open, the more complete the joy of heaven is. And the more souls who resonate together, the greater the intensity of their love, and, mirror like, each soul reflects the other.
When someone with the authority of a teacher, say, describes the world and you are not in it, there is a moment of psychic disequilibrium, as if you looked into a mirror and saw nothing. Yet you know you exist and others like you, that this is a game with mirrors. It takes some strength of soul--and not just individual strength, but collective understanding--to resist this void, this nonbeing, into which are thrust, and to stand up, demanding to be seen and heard.
Knowledge of the Absolute depends upon no book, nor upon anything; it is absolute in itself. No amount of study will give this knowledge; is not theory, it is realization. Cleanse the dust from the mirror, purify your own mind, and in a flash you know that you are Brahman.
Surely there had been no figure leaning on the back of his chair; no face looking over it. It is certain that no gliding footstep touched the floor, as he lifted up his head, with a start, and spoke. And yet there was no mirror in the room on whose surface his own form could have cast its shadow for a moment; and, Something had passed darkly and gone!
A story of particular facts is a mirror which obscures and distorts that which should be beautiful; poetry is a mirror which makes beautiful that which it distorts.
Other people teach us who we are. Their attitudes to us are the mirror in which we learn to see ourselves, but the mirror is distorted. We are, perhaps, rather dimly aware of the immense power of our social enviornment.