TEMPER.--The principal of these things, is the mastery of one’s temper, and that coolness of mind, and serenity of countenance, which hinders us from discovering, by words, actions, or even looks, those passions or sentiments, by which we are inwardly moved or agitated; and the discovery of which, gives cooler and abler people such infinite advantages over us, not only in business, but in all the most common occurrences of life. A man who does not possess himself enough to hear disagreeable things, without visible marks of anger and change of countenance, or agreeable ones without sudden bursts of joy and expansion of countenance, is at the mercy of every artful knave, or pert coxcomb; the former will provoke or please you by design, to catch unguarded words or looks, by which he will easily decipher the secrets of your heart, of which you should keep the key yourself, and trust it with no man living. [_Same date._] IMMOBILITY.--Determine, too, to keep your countenance as unmoved and unembarrassed as possible which steadiness you may get a habit of, by constant attention. I should desire nothing better, in any negotiation, than to have to do with one of these men of warm, quick passions; which I would take care to set in motion. By artful provocations, I would extort rash and unguarded expressions; and, by hinting at all the several things that I could suspect, infallibly discover the true one, by the alteration it occasioned in the countenance of the person. _Vólto sciolto con pensieri stretti_,[40] is a most useful maxim in business. [_Same date._] DISSIMULATION.--It may be objected, that I am now recommending dissimulation to you; I both own and justify it. It has been long said: _Qui nescit dissimulare nescit regnare_: I go still farther, and say, that without some dissimulation, no business can be carried on at all. It is _simulation_ that is false, mean and criminal; that is the cunning which Lord Bacon calls crooked or left-handed wisdom, and which is never made use of but by those who have not true wisdom. And the same great man says, that dissimulation is only to hide our own cards; whereas simulation is put on in order to look into other people’s. Lord Bolingbroke in his “Idea of a Patriot King,” which he has lately published, and which I will send you by the first opportunity, says, very justly, that simulation is a _stiletto_; not only an unjust but an unlawful weapon, and the use of it very rarely to be excused, never justified. Whereas dissimulation is a shield, as secrecy is armor; and it is no more possible to preserve secrecy in business, without some degree of dissimulation, than it is to succeed in business without secrecy. [_Same date._]