people can do.

If your course of experimental philosophy with Abbe Nolot is over, I
would have you apply to Abbe Sallier, for a master to give you a general
notion of astronomy and geometry; of both of which you may know as much,
as I desire you should, in six months' time. I only desire that you
should have a clear notion of the present planetary system, and the
history of all the former systems. Fontenelle's 'Pluralites des Mondes'
will almost teach you all you need know upon that subject. As for
geometry, the seven first books of Euclid will be a sufficient portion of
it for you. It is right to have a general notion of those abstruse
sciences, so as not to appear quite ignorant of them, when they happen,
as sometimes they do, to be the topics of conversation; but a deep
knowledge of them requires too much time, and engrosses the mind too
much. I repeat it again and again to you, Let the great book of the world
be your principal study. 'Nocturna versate manu, versate diurna'; which
may be rendered thus in English: Turn Over MEN BY DAY, AND WOMEN BY
NIGHT. I mean only the best editions.

Whatever may be said at Paris of my speech upon the bill for the
reformation of the present calendar, or whatever applause it may have met
with here, the whole, I can assure you, is owing to the words and to the
delivery, but by no means to the matter; which, as I told you in a former
letter, I was not master of. I mention this again, to show you the
importance of well-chosen words, harmonious periods, and good delivery;
for, between you and me, Lord Macclefield's speech was, in truth, worth a
thousand of mine. It will soon be printed, and I will send it you. It is
very instructive. You say, that you wish to speak but half as well as I
did; you may easily speak full as well as ever I did, if you will but
give the same attention to the same objects that I did at your age, and