Let him be taught to be curious in the election and choice of his reasons, to abominate impertinence, and consequently, to affect brevity; but, above all, let him be lessoned to acquiesce and submit to truth so soon as ever he shall discover it, whether in his opponent's argument, or upon better consideration of his own; for he shall never be preferred to the chair for a mere clatter of words and syllogisms, and is no further engaged to any argument whatever, than as he shall in his own judgment approve it: nor yet is arguing a trade, where the liberty of recantation and getting off upon better thoughts, are to be sold for ready money: "Neque, ut omnia, qux praescripta et imperata sint, defendat, necessitate ulla cogitur." ["Neither is their any necessity upon him, that he should defend all things that are prescribed and enjoined him." -- Cicero, Acad., ii.

3.] If his governor be of my humour, he will form his will to be a very good and loyal subject to his prince, very affectionate to his person, and very stout in his quarrel; but withal he will cool in him the desire of having any other tie to his service than public duty.

Besides several other inconveniences that are inconsistent with the liberty every honest man ought to have, a man's judgment, being bribed and prepossessed by these particular obligations, is either blinded and less free to exercise its function, or is blemished with ingratitude and indiscretion.

A man that is purely a courtier, can neither have power nor will to speak or think otherwise than favourably and well of a master, who, amongst so many millions of other subjects, has picked out him with his own hand to nourish and advance; this favour, and the profit flowing from it, must needs, and not without some show of reason, corrupt his freedom and dazzle him; and we commonly see these people speak in another kind of phrase than is ordinarily spoken by others of the same nation, though what they say in that courtly language is not much to be believed.
Let his conscience and virtue be eminently manifest in his speaking, and have only reason for their guide.

Make him understand, that to acknowledge the error he shall discover in his own argument, though only found out by himself, is an effect of judgment and sincerity, which are the principal things he is to seek after; that obstinacy and contention are common qualities, most appearing in mean souls; that to revise and correct himself, to forsake an unjust argument in the height and heat of dispute, are rare, great, and philosophical qualities.
Let him be advised, being in company, to have his eye and ear in every corner; for I find that the places of greatest honour are commonly seized upon by men that have least in them, and that the greatest fortunes are seldom accompanied with the ablest parts.