Continues the same subject. Explains what is meant by the Prayer of Quiet. Gives several counsels to those who experience it. This chapter is very noteworthy.

It is a great favour which the Lord grants to these souls, for it unites the active life with the contemplative. At such times they serve the Lord in both these ways at once; the will, while in contemplation, is working without knowing how it does so; the other two faculties are serving Him as Martha did. Thus Martha and Mary work together. I know someone to whom the Lord often granted this favour; she could not understand it and asked a great contemplative about it, he told her that what she described was quite possible and had happened to himself. I think, therefore, that as the soul experiences such satisfaction in this Prayer of Quiet the will must be almost continuously united with Him Who alone can give it happiness.      

I think it will be well, sisters, if I give some advice here to any of you whom the Lord, out of His goodness alone, has brought to this state, as I know that this has happened to some of you. First of all, when such persons experience this joy, without knowing whence it has come to them, but knowing at least that they could not have achieved it of themselves, they are tempted to imagine that they can prolong it and they may even try not to breathe. This is ridiculous: we can no more control this prayer than we can make the day break, or stop night from falling; it is supernatural and something we cannot acquire. The most we can do to prolong this favour is to realize that we can neither diminish nor add to it, but, being most unworthy and undeserving of it, can only receive it with thanksgiving. And we can best give thanks, not with many words, but by lifting up our eyes, like the publican.

(Keep in mind that she is writing to sisters in a cloistered contemplative order.)