Doroga's Maunche Text

Doroga's lady requested that we try to find a way to work a particular quote from Cervantes into the text.  Can you figure out what that quote is?

I did not know who would be reading this, so I did not get too creating with 16th century spelling.

Brennan Rey and Caoilfhionn Reyna to our good and gentle Doroga Voronin, greetings and all good of the goods.  Noble persons of exalted lineage have brought us word of your singular excellence.  It is said that, if one would view in equal balance the shining Phoebus and the blood-stained Mars, look to Doroga, in whom the one and the other are not separate.  In him, both pen and sword are manifest with such discretion, art and dexterity that he has made of bladework both science and art.  We are by these words greatly moved and being so moved, we do now, of our especial grace, certain science, and mere motion, give and grant and by these presents for us, our heirs and successors give, grant and by the present charter confirm unto you the status, estate and renown of a companion of the Order of the Maunche, with all rights, privileges, prerogatives, commodities, jurisdictions, royalties, franchises, and preeminences attending thereupon.  And we do further grant unto you the right to bear Arms in the form following: Per pale purpure and vert, on a chief argent a raven displayed sable.  And we do further instruct and command you to bear upon your person hereafter and in all times coming the badge and signacle of the Order of the Maunche so that the love and esteem we bear you be made manifest to all persons of whatever estate.  For the greater security and stability of the aforesaid, know that we have laid our hands upon the holy relics of our Realm and sworn to keep, observe and fulfill all of the within promises, and each part of parcel of them, really and in fact, renouncing all deception, mental reservation, and subterfuge.  Witness ourselves, at Malagentia, upon 14 July, in the fifty-third year of the Society.