As you found your brain considerably affected by the cold, you were very prudent not to turn it to poetry in that situation; and not less judicious in declining the borrowed aid of a stove, whose fumigation, instead of inspiration, would at best have produced what Mr. Pope calls a souterkin of wit.  I will show your letter to Duval, by way of justification for not answering his challenge; and I think he must allow the validity of it; for a frozen brain is as unfit to answer a challenge in poetry, as a blunt sword is for a single combat.

You may if you please, and therefore I flatter myself that you will, profit considerably by your stay at Berlin, in the article of manners and useful knowledge.  Attention to what you will see and hear there, together with proper inquiries, and a little care and method in taking notes of what is more material, will procure you much useful knowledge.  Many young people are so light, so dissipated, and so incurious, that they can hardly be said to see what they see, or hear what they hear:  that is, they hear in so superficial and inattentive a manner, that they might as well not see nor hear at all.  For instance, if they see a public building, as a college, an hospital, an arsenal, etc., they content themselves with the first ‘coup d’oeil’, and neither take the time nor the trouble of informing themselves of the material parts of them; which are the constitution, the rules, and the order and economy in the inside.  You will, I hope, go deeper, and make your way into the substance of things.  For example, should you see a regiment reviewed at Berlin or Potsdam, instead of contenting yourself with the general glitter of the collective corps, and saying, ‘par maniere d’acquit’, that is very fine, I hope you will ask what number of troops or companies it consists of; what number of officers of the Etat Major, and what number of subalternes; how many ‘bas officiers’, or non-commissioned officers, as sergeants, corporals, ‘anspessades, frey corporals’, etc., their pay, their clothing, and by whom; whether by the colonels, or captains, or commissaries appointed for that purpose; to whom they are accountable; the method of recruiting, completing, etc.

The same in civil matters:  inform yourself of the jurisdiction of a court of justice; of the rules and numbers and endowments of a college, or an academy, and not only of the dimensions of the respective edifices; and let your letters to me contain these informations, in proportion as you acquire them.

I often reflect, with the most flattering hopes, how proud I shall be of you, if you should profit, as you may, of the opportunities which you have had, still have, and will have, of arriving at perfection; and, on the other hand, with dread of the grief and shame you will give me if you do not.  May the first be the case!  God bless you!

LETTER LXIV