[23] He goes on to say, writing in 1677, "About a year since, Robert Barclay and Benjamin Furly took that city in the way from Frederickstadt to Amsterdam, and gave them a visit; in which they informed them somewhat of Friends' principles, and recommended the Testimony of Truth to them as both a nearer and more certain thing than the utmost of De Labadie's doctrine. They left them tender and loving." Travels in Holland, Penn's Select Works, p. 453. Barclay's visit bore fruit beyond what he possibly could have foreseen. The Princess learnt heartily to esteem and love the brotherhood, welcomed the visits of its ministers, and used her influence at the English court for their relief from harassing persecution. From this time until her death she kept up a correspondence with Robert Barclay, which is included in the printed but not published Reliquæ Barclaianæ. It would seem that this visit also afforded the opportunity for conversation with one Herr Adrian Paets, Dutch Ambassador to the court of Spain, which led to the production of one of Barclay's minor works. The subject of their converse was the very soul of Quakerism, the inward and immediate revelations of the Holy Spirit. Paets stated his objections, and wished Barclay to reconsider the whole question. The Apologist did this, and was more than ever satisfied with his own position. Accordingly he wrote to Herr Paets a long letter in Latin full of subtle reasonings in his very best style, replying to the objections urged. Paets promised an answer to the letter but never sent it. However, when he met Barclay in London some years after, he acknowledged that he had been mistaken in his notions of the Quakers, for he found they could make a reasonable plea for the foundation of their religion. Barclay afterwards translated his letter into English, and published it. This was a kind of service in which he was quite at home, and in his quiet northern home doubtless it kept him constantly employed. His English friends had not the leisure necessary to do the work in the thorough style in which he performed it. How diligently he laboured in this field, the facts already stated attest.