The soul’s reaction to the states it passes through is reflected in the words written by Kabbalists. That reaction is collected in the prayer book entitled Siddur (the “order” of undergone states). We don’t understand what the prayers describe, nor the soul’s impressions that are recorded in the appellations, letters, their combinations, or the arrangement of the words in the sentences.
The entire prayer book is organized so that for any soul that experiences transformations in a specific state this process is expressed in the same words of the prayer. It is not necessary to articulate the words out loud. The soul will feel them within; the prayer will become its internal construction.
Every letter is a certain order, a sequence of the forces that receive and bestow. Additionally, within the letters, there are “vowel marks,” the fillings, a complete TANTA (Ta’amim, Nekudot, Tagin, Otiot or lights, points, crowns above letters, and letters), the states we are going through.
Our internal desires alter and assume all kinds of forms that instill various feelings in us. In turn, when transferred to paper these sensations receive a specific form of spiritual elements in letters, words, and sentences.
In other words, a prayer is an external expression of internal spiritual sensations. A person doesn’t really need a prayer book. If he is experiencing such internal states, they will become his prayer.
A prayer book is needed in order to look at the shape of the letters and visualize (if we are already able to do so) what states we need to undergo, to imagine what awaits us ahead. If I am already in the spiritual world, then based on what I am reading in the prayer book, I can somewhat perceive what is going to happen to me, what states I am going to enter.
In this world, I am familiar with various human emotions. Hence, while reading a novel for example, I can feel and experience the events being described internally. The same goes for the spiritual world.
From the 3rd part of the Daily Kabbalah Lesson 4/21/2011, Beit Shaar HaKavanot