We have seen that Du Maurier employed his best offices for Barnevelt and Grotius.

From the time they were arrested all correspondence between the Ambassador and Grotius was probably cut off till the beginning of 1621; for it is not till the fifteenth of January that year, he returns him his thanks[106].

He says it is impossible for him to express his obligations to the Most Christian King, to his wife Council, and to Du Maurier in particular, for the pains they took to assist him in his misfortunes; that tho' their intentions had not the effect which might have been hoped for, it gave him great consolation to find persons of such importance interest themselves in his troubles.

He calls his conscience, as the judge he most respected, to witness, that all he intended was the prevention of schism; that he never had a thought of making any innovation in the Republic; that he only purposed the supporting the rights of his Sovereigns, without invading the legal authority of the States-General; that such as were in the secret of affairs knew that his whole crime was refusing to comply with the caprices of those who wanted to rule according to their fancies; and that he chose rather to lose his estate and his health, than to ask pardon for a fault he had never committed.
Du Maurier losing his lady about this time, Grotius writes him, February 27, 1621, a very handsome consolatory letter, in which he deduces with great eloquence every ground of support that Philosophy and Religion can suggest in that melancholly event.

The only method he took to unbend and recreate himself, was to go from one work to another.