Dave Oranchak wrote this aricle http://www.zodiackillerciphers.com/?p=144 featuring Edward, Earl of Clarendon, lord high chancellor of England, regarding the 408 Cipher and the cipher text. I came across this article by chance as I was researching the origin of the Riverside Desktop Poem title ‘Sick of living/unwilling to die.’
Dave Oranchak "So, only one piece of text, from a vast collection of eleven billion pieces of text, fit into this chunk of cipher text. A one in eleven billion chance seems to suggest some significance. But don’t be fooled by this. Just because this rare event occurred, doesn’t mean it is anything more than a simple coincidence. If we didn’t already know the real solution to the 408, how do we know that this chunk of old and obscure text isn’t the correct solution? "

However I did find an important quote from Edward, Earl of Clarendon featuring ‘weary of life/unwilling to die.

"Naturally a substantial portion of Clarendon’s surviving manuscripts comprises his personal correspondence — both letters received by him from numerous correspondents and his own letters, written or signed by him, whether drafts, retained copies, or the letters actually sent. Among many notable examples are his letters written in August 1646 to William, Lord Widdrington, and to Sir John Berkeley, announcing the beginnings of his History of the Rebellion (Bodleian, MS Clarendon 28, ff. 165r, 178r-9r), and the letter he wrote on 12 November 1646, to Sir Edward Nicholas, describing his plan for the work and stating that he had already completed sixty sheets of it (Bodleian, MS Clarendon 29, ff. 4r-6r). Some of his letters, particularly those dating from the Civil War period, are wholly or partly in cipher or make use of pseudonyms in both salutations and signatures. The codes to sixteen such ciphers used by the Royalists are written out in Bodleian, MS Clarendon 94, and see also British Library, Egerton MS 2550, ff. 42r, 74r."
http://www.celm-ms.org.uk/introductions … dHyde.html

http://cryptiana.web.fc2.com/code/clarendon.htm

1661-1674: The Right Honourable The First Earl of Clarendon Kt PC