On all the Military details and outlines, and on all the Diplomacies of this business, here are two Oracles extremely worth consulting by the young King.
To seize Silesia is easy: a Country open on all but the south side; open especially on our side, where a battalion of foot might force it; the three or four fortresses, of which only two, Glogau and Neisse, can be reckoned strong, are provided with nothing as they ought to be; not above 3,000 fighting men in the whole Province, and these little expecting fight.

Silesia can be seized: but the maintaining of it ?--We must try to maintain it, thinks Friedrich.
At Reinsberg it is not yet known that Kur-Baiern has protested; but it is well guessed he means to do so, and that France is at his back in some sort.

Kur-Baiern, probably Kur-Sachsen, and plenty more, France being secretly at their back.

What low condition Austria stands in, all its ready resources run to the lees, is known; and that France, getting lively at present with its Belleisles and adventurous spirits not restrainable by Fleury, is always on the watch to bring Austria lower; capable, in spite of Pragmatic Sanction, to snatch the golden moment, and spring hunter-like on a moribund Austria, were the hunting-dogs once out and in cry.

To Friedrich it seems unlikely the Pragmatic Sanction will be a Law of Nature to mankind, in these circumstances.