From this and other circumstances, which it would take too long to repeat here, it will be seen that the fury of my powerful persecutors continually increases. They have at length chosen to reveal themselves to me; for about two months ago, when a dear friend of mine at Rome was speaking of my affairs to Father Christopher Griemberger, mathematician at the college there, this Jesuit uttered the following precise words:—‘_If Galileo had only known how to retain the favour of the fathers of this college, he would have stood in renown before the world, he would have been spared all his misfortunes, and could have written what he pleased about everything, even about the motion of the earth._’ From this you will see, honoured Sir, that it is not this opinion or that which has brought, and still brings about my calamities, _but my being in disgrace with the Jesuits_. I have also other proofs of the watchfulness of my persecutors. One is that a letter from some foreigner, I do not know from whom, addressed to me at Rome, where he supposed me still to be, was intercepted, and delivered to Cardinal Barberini. It was fortunate for me, as was afterwards written to me from Rome, that it did not purport to be an answer to one from me, but a communication containing the warmest praises of my “Dialogues.” It was seen by many persons, and, as I hear, copies of it were circulated at Rome. I have also been told that I might see it. To add to all this, there are other mental disquietudes and many bodily sufferings oppressing me at the age of over seventy years, so that the least exertion is a torment and a burden to me. In consideration of all this, my friends must be indulgent to me for omissions which look like neglect, but really arise from inability.”[489] This deep dejection, however, could not last long with a man of so active a mind as Galileo. The impulse which had been implanted in him to investigate the problems of nature was too strong to be repressed by either mental or bodily sufferings. So far from it, it was this which, ever re-asserting itself with its normal energy, helped him to bear them with resignation, and he often forgot his painful situation in his scientific speculations. Thus, but a few months after his daughter’s death, we find him rousing himself and eagerly at work again on his masterpiece, the “Dialoghi delle Nuove Scienze.”[490] He also resumed his extensive scientific correspondence, of which unfortunately, and especially of the following year, 1635, the letters of his correspondents only have mostly come down to us.[491]