Luke 17:35

One will be taken, and the other left. That part which has engaged in marriage only for the love of offspring and has dispensed earthly substance for acquiring heavenly things will be taken; but that which has served marriages for the allurements of the flesh, and whatever earthly things it may have offered to the Church or the poor, did so in order that, as if having made a bargain with the Lord, it might more abundantly abound with these things, will be left.

He says, "Two women will be grinding at a mill. The one will be taken, and the other left." By these he again seems to mean those who live in poverty and labor. Even in these, he says that there is a certain vast difference. Some have carried the burden of poverty courageously, honoring a serious and virtuous way of life. Others have been of a different character. They are planners for every wicked practice and all shamefulness. There will be even in their case a full and exact investigation of their manners. The good will be taken, and he that is not good will be left.

There will be two grinding at the mill. He calls those grinding at the mill who are placed among the people and are governed by teachers, doing the things of this world, whom he also signifies by the name of women, because, as I said, it is expedient for them to be governed by the counsels of the skilled. And he said grinding, on account of the circle and cycle of temporal affairs. Yet he said in one grinding, inasmuch as they provide for the uses of the Church out of their own resources and businesses. For every action of this world is a mill, which while it gathers many cares, it turns human minds as if in a circle, and casts forth like flour, because it constantly generates minute thoughts in a restless heart.