Galileo Galilei, Johannes Kepler,

“ And the remainder, though easyer to procure, were harder to be understood; as Tartaglia his notes on Archimedes, Torricellio his Doctrine of Projects, Galileo his Epistle to the Dutchesse of Tuscany, and above all his Dialogues de Motu; (never till now done into any Language) which were so intermixt of Latine and Italian, that the difficulty of the Stile, joyned with the intricatnesse of the Subject rendered them Unpleasant, if not wholly Vnintelligible, to such as were not absolute Masters of both the Tongues. ”

“ As for the second Tome, I have only this to assure the Generous Readers; 1 that I am very confident I shall be much more punctual in publishing that, than (for the reasons above related.) I was able to be in setting forth this: 2 that they shall not be abused in advancing of their moneys, (as hath bin used in the like case) by selling the remaining Copyes at an under rate; and 3 that I have a very great care that no disesteem may by my means arise unto this way of publishing Books, for that it is of excellent use in ushering Great and Costly Volumes into the World. ”

“ But, on the contrary, my Author having bin indefinite in his discourse, I shall forbear to exasperate, and attempt to reconcile such persons to this Hypothesis as devout esteem for Holy Scripture, and dutifull Respect to Canonical Injunctions hath made to stand off from this Opinion: and therefore for their sakes I have at the end of the Dialogues by way of supplement added an Epistle of Galileo to Her Most Serene Highness Christina Lotharinga the Grand Dutchesse Mother of Tuscany ”