They maintained a correspondence by letters even at the time when the people of Holland were most exasperated against Grotius; and by a Letter from that Prince, which is still remaining, we may judge that Grotius did him good service at Paris; and that Frederic Henry was greatly disposed to serve him.
This Letter deserves to be copied entire: it is dated August 4, 1622.
"Sir, I thank you for the good offices you have done me with some of the King's Council, and beg of you to continue them both with these, and with others, as you shall think proper; assuring you that I shall acknowledge your friendship on all occasions where I can serve you; being bound to it by the friendship which you have ever shewn to me.

I have asked your brother-in-law Mr.Reigersberg to write to you particularly about an affair in which I should be glad to have your opinion: you will oblige me much by sending it, as you have already done by the memorial you remitted to me; for which I sincerely thank you.

I could wish to be of use in your affairs in this Country, and would labour in them most chearfully: but you know the constitution of things is such, that neither I, nor your other friends, can serve you agreeably to our wishes.

I would fain hope that time will bring about some change, and that I shall see you again here esteemed and honoured as your great qualities deserve; which will give me no less pleasure than I received from your regaining your liberty.

In the mean time, I wish you, while at a distance from your country, all the satisfaction, prosperity, and happiness which you can desire.