Moreover, he had put forth many books that were most devout, touching matters of the higher understanding, which books, of his wisdom, he wrote in the Teutonic tongue; and he poured forth in liberal abundance that grace of heavenly sweetness which he had received from God, for the use of his neighbour and them that should come after in the Church.

There are eleven books which he composed either before or after his entrance into the Religious Life; and less the tale should be incomplete, the book of his letters doth make that number up to twelve.
There was in the same monastery, under this venerable Master, a Convert whose name was John, a man very devout, who did humbly devote himself to his life's end to serving in the kitchen, and he was illumined with special grace for divine contemplation.

He compiled a great and notable book, filled with high and heavenly doctrine, in the which he doth commend his most beloved father, John Ruesbroeck, in most excellent wise.
In the same monastery also were certain other most devout Fathers and Religious Brothers, eminent for their life and wisdom, as their holy works that have come down to us do testify.
Concerning the life and writings of John Ruesbroeck and Brother John Cocus, more is told in a little book that hath been put forth of late, and that is entitled "Of the Origin of the Monastery of the Groenendaal.".