The structure of the soul consists of four parts. Therefore, the following condition that passes through a person after the intrauterine development of the soul is a division into certain parts, the so-called TANTA: Taamim, Nekudot, Tagin, Otiot or Hochma, Bina, Zeir Anpin (Tifferet), and Malchut.
The main thing is that these stages, like the four stages of direct light, initially build us according to the levels of Aleph, Bet, Gimel, and Dalet. Thus, the desire derives from the light, i.e., from the property of the Creator, and the property of creation develops through four stages, the desire to receive comes from the desire to give.
Similarly, in the four stages at each level in each segment, the so-called four-letter changes occur called Taamim, Nekudot, Tagin, and Otiot. They are manifested onto every smallest desire, both onto desires that are joined together and onto those that combine together in one spiritual Kli (desire).
That is, the law is simple, a four-stage distribution, formation, and creation of desire. We can track the same thing in our world on inanimate, vegetative, animate, and human levels of nature. Each of these levels is divided into its four stages.
Therefore, when we develop spiritually, we will surely go through all four stages on our desire, which gradually begins to create and grow us through internal division. In principle, as it happens in a human embryo it also happens within us.
From KabTV’s “Fundamentals of Kabbalah” 2/16/20