Galileo’s letters to Mgr. Dini of 16th February and 28th March,[111] plainly show how unwillingly he had been driven into the theological field by his opponents. After he had in the second letter decidedly rejected Dini’s suggestion that he should treat the Copernican system merely as a hypothesis, he added that it had been his earnest desire to keep strictly to his part as a man of science, and not to be compelled to defend his astronomical system against religious scruples. He entirely agrees with those who say that the task of bringing natural science into agreement with Holy Scripture should be left to theologians, and shows that he has been compelled to defend himself on this dangerous ground. He says besides that his letter to Castelli was not originally intended to go any farther, and regrets that Castelli had had copies made of it without his knowledge.
It is a noteworthy circumstance that at the very time when the secret denunciation had been laid before the tribunal of the Inquisition at Rome, all the letters and reports which Galileo received from Rome, even from trustworthy friends, Mgrs. Dini, Ciampoli, and Prince Cesi, were calculated to allay his anxious fears. None of those persons, although in influential positions, and likely it would seem to have been better informed, knew, as appears from their correspondence with Galileo, anything of the proceedings which were being instituted at Rome against him and the Copernican system. The Inquisition knew well enough how to keep its secrets. On 28th February[112] Mgr. Ciampoli writes confidently to Galileo that, notwithstanding all the inquiries he had made, he could learn nothing of any measures against him or the new doctrines; he sets down the whole rumour to the incautious talk of some hot-headed fellow.
On 7th March[113] Dini tells Galileo that Cardinal Bellarmine had said “he did not think that the work of Copernicus would be prohibited, and the worst that would happen would be that some addition would be made to it, stating that this theory was only accepted to explain phenomena,[114] or some such phrase, and with this reservation Galileo would be able to discuss the subject whenever he had occasion.” Under the same date Prince Cesi tells Galileo that a work had just been published by a Dominican monk, which brilliantly defended the opinion of Copernicus and made it agree with Holy Scripture. He adds that the work could not have appeared more opportunely.[115]