Poetry is not like reasoning, a power to be exerted according to the determination of the will. A man cannot say, 'I will compose poetry.' The greatest poet even cannot say it; for the mind in creation is as a fading coal, which some invisible influence, like an inconstant wind, awakens to transitory brightness...and the conscious portions of our natures are unprophetic either of its approach or its departure.
Percy Bysshe ShelleyWe rest; a dream has power to poison sleep. We rise; one wand'ring thought pollutes the day. We feel, conceive, or reason; laugh or weep, Embrace fond woe, or cast our cares away; It is the same: for, be it joy or sorrow, The path of its departure still is free. Man's yesterday may ne'er be like his morrow; Nought may endure but Mutability!
Percy Bysshe ShelleyWhen merciless ambition, or mad zeal, has led two hosts of dupes to battlefield, That, blind, they there may dig each other's graves, And call the sad work glory.
Percy Bysshe Shelley