25 “Yet once more,” I hear the Scripture say that the heaven and the earth shall be shaken, inasmuch as this has befallen them before, signifying, as I suppose, a manifest renovation of all things. And we must believe S. Paul when he says that this last shaking is none other than the second coming of Christ, and the transformation and changing of the universe to a condition of stability which cannot be shaken. And I imagine that this present shaking, in which the contemplatives and lovers of God, who before the time exercise their heavenly citizenship, are shaken from us, is of no less consequence than any of former days.
For, however peaceful and moderate in other respects these men are, yet they cannot bear to carry their reasonableness so far as to be traitors to the cause of God for quietness' sake: nay on this point they are excessively warlike and sturdy in fight; such is the heat of their zeal, that they would sooner proceed to excess in disturbance, than fail to notice anything that is amiss. And no small portion of the people is breaking away with them, flying away, as a flock of birds does, with those who lead the flight, and even now does not cease to fly with them.
Source: Orations (New Advent)