That single thought is enough. The impulse increases to a wish, the wish to a desire, the desire to an uncontrollable longing, and the longing (to the deep regret and mortification of the speaker, and in defiance of all consequences,) is indulged.
Edgar Allan PoeAnd then there stole into my fancy, like a rich musical note, the thought of what sweet rest there must be in the grave.
Edgar Allan PoeIt is impossible to say how first the idea entered my brain, but, once conceived, it haunted me day and night.
Edgar Allan Poe