The other tendency in the movement, which received its fullest expression in the group of Collegiants at Rynsburg and their friends in Amsterdam, had a still greater parallelism with Quakerism, in fact, the most important book which came from a member of this group--_The Light on the Candlestick_--is indistinguishable in its body of ideas from Quaker teaching, and differs only in one point, that it reveals a more philosophically trained mind in the writer than does any early Quaker book with the single exception of Barclay's _Apology_. The author of _The Light on the Candlestick_--written originally in Dutch and published in 1662 under the title _Lucerna super candelabro_--was probably Peter Balling, though the book, with characteristic Collegiant modesty, was published anonymously. Peter Balling was one of an interesting group of scholarly Collegiants who became very intimate friends of Baruch Spinoza, and who received from the Jewish philosopher a strong impulse toward mystical religion. Before they became acquainted with the young Spinoza, however, they had already received through Descartes a powerful intellectual awakening, {124} and had discovered that consciousness itself, when fully sounded, has its own unescapable evidence of God. It is not possible here to turn aside and study adequately this extraordinary philosophical movement known as Cartesianism, beginning in Descartes (1596-1650) and culminating in Spinoza (1632-1677), but the distinct religious influence of it is so profoundly apparent, both in Peter Balling and in the Quaker apologist Robert Barclay (1648-1690), that a very brief review of the contribution from this source seems necessary.