In the first year of his reign I Daniel understood from the books the number of the years, of which the word of the LORD came to Jeremiah the prophet, that he would accomplish seventy years in the desolations of Jerusalem.
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Aquinas Study Bible
AD 2017
seventy years: In one sense, which Jeremiah saw, this meant the length of captivity - Daniel does not contradict, but extends the prophecy by taking weeks of years instead of single years, about 70 weeks of years. So we believe that the mixture of references comes from the well-known pattern of multiple fulfillment. (Fr. Most)
Jerusalem. He read attentively the sacred volumes, particularly the prophecy of Jeremias xxv. 11. and xxix. 10. Knowing that many predictions were conditional, he was afraid lest this might be so; notwithstanding a part of it seemed to be verified by the death of Baltassar. (Calmet)
Darius had reigned in Persia before. He only ruled part of a year, at Babylon, the 70th of the captivity, 2 Paralipomenon xxxvi. 22. Daniel perceiving that the time of the Jews' deliverance was at hand, prayed with great zeal and confidence. (Worthington)
Jeremiah had predicted seventy years for the desolation of the Temple (Jer. 52:29), at the end of which the people would again return to Judaea and build the Temple and the city of Jerusalem. But this fact did not render Daniel careless, but rather encouraged him to pray that God might through his supplications fulfil that which He had graciously promised. Thus he avoided the danger that carelessness might result in pride, and pride cause offense to the Lord. Accordingly we read in Genesis (chap. 9) [sic!] that prior to the Deluge one hundred and twenty years were appointed for men to come to repentance; and inasmuch as they refused to repent even within so long an interval of time as a hundred years, God did not wait for the remaining twenty years to be fulfilled, but brought on the punishment earlier which He had threatened for a later time. [This deduction seems to have been based upon the fact that Gen. 5:32 mentions that Noah was five hundred years old when he had begotten Ham, Sh...