Study became his business and consolation.

From the time he was a prisoner at the Hague[102], whilst he had the use of pen and ink, he employed himself in writing a Latin piece on the means of accommodating the present disputes.

This treatise was presented to Prince Maurice; but it did not mollify the indignation he had conceived against the Remonstrants.

Grotius maintained in it, as he had done often before, that notwithstanding difference of opinion in some points relating to grace and predestination, a mutual toleration ought to take place, and no separation be made.
We have still several of his letters written from Louvestein, which acquaint us in what manner he spent his time.

He gave Vossius an account of his studies.