Sparrow, John. An Exposition of Some Principal Matters and Words in the Writings of Jacob Boehme. But since the lovers desire a Clavis, or key of my writings, I am ready and willing to pleasure them in it, and will set down a short description of the ground of those strange words; some of which are taken from nature and sense, and some are the words of strange masters, which I have tried according to sense, and found them good and fit. I will write but a short description of the divine manifestation, yet as much as I can comprehend in brief; and expound the strange words for the better understanding of our books for the consideration and help of beginners.