u will send
me very minute accounts from Rome, not of what you see, but, of who you
see; of your pleasures and entertainments. Tell me what companies you
frequent most, and how you are received.

LETTER XCVII

LONDON, December 19, O. S. 1749.

DEAR BOY: The knowledge of mankind is a very use ful knowledge for
everybody; a most necessary one for you, who are destined to an active,
public life. You will have to do with all sorts of characters; you
should, therefore, know them thoroughly, in order to manage them ably.
This knowledge is not to be gotten systematically; you must acquire it
yourself by your own observation and sagacity; I will give you such hints
as I think may be useful land-marks in your intended progress.

I have often told you (and it is most true) that, with regard to mankind,
we must not draw general conclusions from certain particular principles,
though, in the main, true ones. We must not suppose that, because a man
is a rational animal, he will therefore always act rationally; or,
because he has such or such a predominant passion, that he will act
invariably and consequentially in the pursuit of it. No. We are
complicated machines: and though we have one main-spring, that gives
motion to the whole, we have an infinity of little wheels, which, in
their turns, retard, precipitate, and sometimes stop that motion. Let us
exemplify. I will suppose ambition to be (as it commonly is) the
predominant passion of a minister of state; and I will suppose that
minister to be an able one. Will he, therefore, invariably pursue the
object of that predominant passion? May I be sure that he will do so and
so, because he ought? Nothing less. Sickness or low spirits, may damp
this predominant passion; humor and peevishness may triumph over it;
inferior passions may, at times, surprise it and prevail. Is this
ambitious statesman amorous? Indiscreet and unguarded confidences, made
in tender moments, to his wife or his mistress, may defeat all his
schemes. Is he avaricious? Some great lucrative object, suddenly
presenting itself, may unravel all the work of his ambition. Is he
passionate? Contradiction and provocation (sometimes, it may be, too,
artfully intended) may extort rash and inconsiderate expressions, or
actions destructive of his main object. Is he vain, and open to flattery?
An artful, flattering favorite may mislead him; and even laziness may, at
certain moments, make him neglect or omit the necessary