One of Friedrich's grand purposes at Reinsberg, to himself privately the grandest there, which he follows with constant loyalty and ardor, is that of scaling the heights of the Muses' Hill withal; of attaining mastership, discipleship, in Art and Philosophy;--or in candor let us call it, what it truly was, that of enlightening and fortifying himself with clear knowledge, clear belief, on all sides; and acquiring some spiritual panoply in which to front the coming practicalities of life. This, he feels well, will be a noble use of his seclusion in those still places; and it must be owned, he struggles and endeavors towards this, with great perseverance, by all the methods in his power, here, or wherever afterwards he might be. Here at Reinsberg, one of his readiest methods, his pleasantest if not his usefulest, is that of getting into correspondence with the chief spirits of his time. Which accordingly he forthwith sets about, after getting into Reinsberg, and continues, as we shall see, with much assiduity. Rollin, Fontenelle, and other French lights of the then firmament,--his Letters to them exist; and could be given in some quantity: but it is better not. They are intrinsically the common Letters on such occasions: "O sublime demi-god of literature, how small are princely distinctions to such a glory as thine; thou who enterest within the veil of the temple, and issuest with thy face shining!"--To which the response is: "Hm, think you so, most happy, gracious, illustrious Prince, with every convenience round you, and such prospects ahead? Well, thank you, at any rate,--and, as the Irish say, more power to your Honor's Glory!" This really is nearly all that said Sets of Letters contain; and except perhaps the Voltaire Set, none of them give symptoms of much capacity to contain more.