These and many other commonplace reflections upon nations or professions in general (which are at least as often false as true), are the poor refuge of people who have neither wit nor invention of their own, but endeavor to shine in company by second-hand finery.  I always put these pert jackanapes out of countenance, by looking extremely grave, when they expect that I should laugh at their pleasantries; and by saying well, and so, as if they had not done, and that the sting were still to come.  This disconcerts them, as they have no resources in themselves, and have but one set of jokes to live upon.  Men of parts are not reduced to these shifts, and have the utmost contempt for them, they find proper subjects enough for either useful or lively conversations; they can be witty without satire or commonplace, and serious without being dull.  The frequentation of courts checks this petulancy of manners; the good-breeding and circumspection which are necessary, and only to be learned there, correct those pertnesses.  I do not doubt but that you are improved in your manners by the short visit which you have made at Dresden; and the other courts, which I intend that you shall be better acquainted with, will gradually smooth you up to the highest polish.  In courts, a versatility of genius and softness of manners are absolutely necessary; which some people mistake for abject flattery, and having no opinion of one’s own; whereas it is only the decent and genteel manner of maintaining your own opinion, and possibly of bringing other people to it.  The manner of doing things is often more important than the things themselves; and the very same thing may become either pleasing or offensive, by the manner of saying or doing it.  ’Materiam superabat opus’, is often said of works of sculpture; where though the materials were valuable, as silver, gold, etc., the workmanship was still more so.  This holds true, applied to manners; which adorn whatever knowledge or parts people may have; and even make a greater impression upon nine in ten of mankind, than the intrinsic value of the materials.  On the other hand, remember, that what Horace says of good writing is justly applicable to those who would make a good figure in courts, and distinguish themselves in the shining parts of life; ’Sapere est principium et fons’.  A man who, without a good fund of knowledge and parts, adopts a court life, makes the most ridiculous figure imaginable.  He is a machine, little superior to the court clock; and, as this points out the hours, he points out the frivolous employment of them.  He is, at most, a comment upon the clock; and according to the hours that it strikes, tells you now it is levee, now dinner, now supper time, etc.  The end which I propose by your education, and which (if you please) I shall certainly attain, is to unite in you all the knowledge of a scholar with the manners of a courtier; and to join, what is seldom joined by any of my countrymen,