Percy Bysshe Shelley, A Defence of Poetry and Other Essays

"Poets are the unacknowledged legislators of the world."

"Sorrow, terror, anguish, despair itself are often the chosen expressions of an approximation to the highest good. Our sympathy in tragic fiction depends on this principle; tragedy delights by affording a shadow of the pleasure which exists in pain. This is the source also of the melancholy which is inseparable from the sweetest melody. The pleasure that is in sorrow is sweeter than the pleasure of pleasure itself."

"A poet is a nightingale who sits in darkness and sings to cheer its own solitude with sweet sounds; his auditors are as men entranced by the melody of an unseen musician, who feel that they are moved and softened, yet know not whence or why."

"A man, to be greatly good, must imagine intensely and comprehensively; he must put himself in the place of another and many others; the pains and pleasures of his species must become his own. The great instrument of moral good is the imagination."