His _De Veritate Religionis Christianae_ and his _Annotationes in Vetus et in Novum Testamentum_ are now out of date; but the _De Veritate_ was in its day a most valuable piece of Christian apologetic and was quickly translated into many languages.

The _Annotationes_ have, ever since they were penned, been helpful to commentators on the Scriptures for their brilliancy and suggestiveness on many points of criticism and interpretation.

His voluminous correspondence, diplomatic, literary, confidential, is rich in information bearing on the history and the life of his time.

Several thousands of these letters have been collected and published.
But if the smouldering embers of bitter sectarian and party strife compelled the most brilliant of Holland's own sons to spend the last twenty-three years of his life in a foreign capital and to enter the service of a foreign state, Holland was at the same time, as we have seen, gaining distinction by the presence within her hospitable boundaries of men of foreign extraction famous for their learning.
It was thus that both the Cartesian and Spinozan systems of philosophy had their birth-place on Dutch soil.

Rene Descartes sought refuge from France at Amsterdam in 1629, and he resided at different places in the United Provinces, among them at the university towns of Utrecht, Franeker and Leyden, for twenty years.