John Trapp on Jeremiah 30:7

Ver. 7. Alaſſe, for that day is great] i. e. Troubleſome and terrible, ſomewhat like the laſt day, the day of judgement, which is therefore alſo called the Great day, becauſe therein the great God will do great things, &c.

It is even the time of Jacobs trouble] Such as never befell him before. Thoſe very dayes ſhall be Affliction: ſo Mark expreſſeth the laſt deſolation, chap. 13.19. not Afflicted only, but Affliction it ſelf. But though it be the time of Jacobs troubles, let it be alſo the time of his trust, for there will be ſhortly a day of his Triumph.

But he ſhall be ſaved out of it] Not from it, but yet out of it: the Lord knoweth how to deliver his, 2 Pet. 2.9. and though Senſe ſay it will not be; Reaſon, it cannot be; yet Faith gets above, and ſayes it ſhall be: I deſcry land.