The Alter Rebbe explains that the letters of speech come from Chochmah, which transcends comprehension. This means: The formation of the letters of speech which proceed from the five organs of articulation is not an intellectual process. Neither nature nor the intellect compels the utterance of the four varying types of pronunciation of these letters in accordance with variations in the movement of the lips, which are moved by the same breath and the same sound that strikes them equally. On the contrary: the change in the movements of the lips depends on the difference in pronunciation of the letters the soul wishes to utter by means of the lips. It is not the other way around, that it is the will and intention of the soul to make a change in the motions of the lips as they are moving now in the utterance of these four letters. Since the soul neither intends nor even knows how to direct the lips to move in the manner required to form particular letters, it is obviously the mere desire to utter certain letters that results in the automatic movement of the lips in the appropriate manner. The pronunciation of the letters and vowels transcends the apprehended and comprehended intellect, but rather derives from the hidden intellect, and the primordial stage of the intellect which is in the articulate soul.
This is: That which is explained above regarding vows that from one perspective they represent abstinence yet from another perspective they can be annulled so as to engage in matters of this world.
Avodah: Which has several stages which are similar.
