“But there are various attitudes with regard to prayer itself corresponding to the three principles of all reality, which Azriel borrowed from the metaphysics of Aristotle while giving them a mystical twist. These three principles are matter, form, and sieresis; this last notion is, however, influenced by the Hebrew translation and replaced by the principle of Nought.
The change of matter into ever-new forms takes place by means of this Nought, which can be made to refer on the one hand—and entirely in the sense of the genuine Aristotelian doctrine—to the privation of that which, in the transformations, is new each time, and, on the other hand—in the sense of the kabbalists—to the influence of the sefirotic principle of Stern Judgment. In either case this notion can link up with that of the mystical Nought, from which everything creative proceeds.
For Azriel, these principles present themselves essentially as follows: the Nought is that which is present in everything that arises as the medium of its transformation. The sefirah of Stern Judgment and delimitation is at the same time the power of transformation inherent in things.
Matter, on the other hand, persists in itself and is renewed without being transformed, like the living stream whose waters are renewed every minute but nevertheless are always the same. This power comes, according to Azriel, from the sefirah of Mercy, by means of which God renews and preserves at the same time, every day, his Creation.
However, according to him, form is a potency inherent in matter, by virtue of which matter receives an influx of ever-new forms. It is similar to the source from which the pool expands.
Accordingly there exist three degrees of prayer in which these three principles are reflected. The lowest is prayer without spirituality, the prayer that is not pervaded by the life of the soul flowing from the source of binah. This, according to Azriel, is the “fixed prayer” mentioned in and rejected by the Mishnah (Berakhoth 14:2), because it is like the stagnant water of a pool into which no life flows from any source.
Above it, there is the prayer that the Mishnah defines as the “imploring of grace,” tahanunim, in which the vitality of the source gushes forth with great force. This is the prayer of the “form.”
The highest prayer, however, is that of the devotee who casts off everything that impedes him and who leads the word whose origin is in the Nought back to its Nought. Here, we can easily follow the transformation of the concept of the Nought or Nothing into a mystical category.
This prayer is named tefillah, in the proper sense of the Hebrew term, which the author derives from pillul, “judgment.” So too must the prayer rise from the petition for the fulfillment of bodily needs to that of the needs of the soul, and from there to the pure spirituality of the life of the future world.”
Gershom Scholem, Origins of the Kabbalah, 420-1.