Later on Sir Politick gives instructions for travellers:

"Some few particulars I have set down,
Only for this meridian, fit to be known
Of your crude traveller....
First, for your garb, it must be grave and serious,
Very reserv'd and lock'd; not tell a secret
On any terms; not to your father: scarce
A fable, but with caution: make sure choice
Both of your company, and discourse; beware
You never speak a truth--
PEREGRINE. How!
SIR P. Not to strangers,
For those be they you must converse with most;
Others I would not know, sir, but at distance,
So as I still might be a saver in them:
You shall have tricks eke passed upon you hourly.
And then, for your religion, profess none,
But wonder at the diversity of all."[198]

Sir Henry Wotton's letter to Milton must not be left out of account of
Jacobean advice to travellers. It is brief, but very characteristic, for
it breathes the atmosphere of plots and caution. Admired for his great
experience and long sojourn abroad, in his old age, as Provost of Eton,
Sir Henry's advice was much sought after by fathers about to send their
sons on the Grand Tour. Forty-eight years after he himself set forth
beyond seas, he passed on to young John Milton "in procinct of his
travels," his favourite bit of wisdom, learned from a Roman courtier
well versed in the ways of Italy: "I pensieri stretti e il viso
sciolto."[199] Milton did not follow this Machiavellian precept to keep