"No one, of a surety, wanders farther from the mark than he who fancies to himself that he already understands this marvellous Kingdom, and can, in few words, fathom its constitution, and everywhere find the right path. To no one, who has broken off, and made himself an Island, will insight rise of itself, nor even without toilsome effort. Only to children, or childlike men, who know not what they do, can this happen. Long, unwearied intercourse, free and wise Contemplation, attention to faint tokens and indications; an inward poet-life, practised senses, a simple and devout spirit: these are the essential requisites of a true Friend of Nature; without these no one can attain his wish."