The pains which he was obliged to take, and the trouble he underwent at the beginning of his new settlement at Paris, did not diminish his passion for literature.

April 23, 1621, he informs Vossius that the irksomeness of his solitary manner of life was relieved by his daily conversations with men of the greatest abilities.

He writes to Andrew Schot from Paris, July 8, 1621, that, delivered from public business which never leaves the mind at ease, and from that croud whose conversation is contagious, he spent the greatest part of his time in prayer, reading the Scriptures, and the ancient interpreters.
He enters into a detail of his studies in a letter to Vossius, September 29, 1621, "I persist, says he, in my respect for sacred antiquity: there are many people here of the same taste.

My six books in Dutch will appear soon (this was his treatise on the Truth of the Christian Religion, in Dutch verse) perhaps I shall also publish the Disquisition On Pelagianism, with the precautions hinted to me by you and some other learned men.

In the mean time, I am preparing an edition of Stobaeus; and to render it more perfect I collate the Greek Manuscripts with the printed copies." He sometimes attended the courts of Justice to hear the Advocates plead, that he might judge of their talents and eloquence.