“Whatever the precise nature of the supreme sefirah, hokhmah is in any case the “beginning of being” as it is also the “beginning of the dibbur.” Prom hokhmah, all the sefiroth proceed in a clear chain of emanations. In terms of Isaac’s language-mysticism, the divine things are at the same time the divine words. The ideas are names.
This motif, already prefigured in the Bahir where the sefiroth coincided with the ten logoi, now appears in a much profounder form. For the kabbalist, evidently, language-mysticism is at the same time a mysticism of script and of letters. The relation between script and language is a constitutive principle for the Kabbalah.
In the spiritual world, every act of speaking is concurrently an act of writing, and conversely every writing is potential speech, destined to become audible. The speaker engraves, as it were, the three-dimensional space of the word on the plane of the ether.
The script, which for the philologist is only a secondary and otherwise rather useless image of real speech, is for the kabbalist the true repository of its secrets. The phonographic principle of a natural transposition of speech into script and vice versa manifests itself in the Kabbalah in the idea that the sacred letters themselves are the lineaments and signs that the modern phoneticist would want upon his disc.
The creative word of God is legitimately stamped upon just these sacred lines. Beyond language lies the unarticulated reflection, the pure thought, the mute profundity, one could say, in which the nameless reposes. Prom hokhmah on there opens up, identical with the world of the sefiroth, the world of the pure name as a primordial element of language. This is the sense in which Isaac understood the saying of Yesirah 2:5, according to which all language proceeds from a name. The tree of divine powers, which formed the sefiroth in the Bahir, is here transposed to the ramifications of the letters in this great name.
But more than that of the tree, Isaac liked the simile of the coal and the flames (shalhabiyoth) that are fed by it, inspired by another passage of Yesirah (1:7) to which he often has recourse:
“ … Their root [that is, that of language and things] is in a name, for the letters are like branches, which appear in the manner of flickering flames, which are mobile, and nevertheless linked to the coal, and in the manner of the leaves of the tree, its boughs and branches, whose root is always in the tree . . . and all the debharim become form and all the forms proceed only from the one name, just as the branch comes from the root. It follows therefore that everything is in the root, which is the one name (on 2:5).
The world of language is therefore actually the “spiritual world.” Only that which lives in any particular thing as language is its essential life.
Raising the above to the level of kabbalistic discourse, the words, dibburim, constitute the world of the sefiroth, which are united in their configurations in order to form letters, just as, conversely, the words themselves are the configurations of letters.
Isaac uses both images though their kaleidoscopic relations are not entirely transparent. In any case, letters are for him the elements of the universal script. According to him, the Hebrew word for letters, ‘othiyoth, derives from the verb ‘atha, to come; the letters are “things which come from their cause,” thus, that which “proceeds” from the root.
But each of these elements comprises in ever new configurations all the sefiroth: “In every letter there are the ten sefiroth.” Thus we are told, in connection with Yesirah 4:1 that the ten sefiroth are “inner [or: hidden] essences” whose inner [hidden] being is contained in the hokhmah, and that they are at the same time the roots of principles in which good and evil are still united.
“They [the sefiroth] begin to grow forth like a tree whose beginnings are unrecognizable, until a plant issues from them.” The verbs employed by the Book Yesirah to describe the formation of the letters that God “hewed” in the pneuma suggest to Isaac the image of a mountain from which raw stones are extracted, then hewed and chiseled, and from which well-ordered edifices come into being.
This “edifice” is the world, but the world of the sefiroth as such also represents a building of this type that issues from its elements, and, in the last analysis, from the hokhmah. The sphere in which this hewing of the innermost elements takes place is not the hidden Sophia, where everything is still conceived as united without form, but the sefirah that follows it, binah or teshubah (“that to which all returns”), which is itself a mystical hyle from which the forms are chiseled.”
Gershom Scholem, Origins of the Kabbalah, pp. 277-9.