How does Brahman become expressed, and what is the process of creation that follows?

According to the teachings in Chapter 50, Brahman, which is originally pure, unmanifest, and beyond the senses, becomes 'qualified' (shabal) through its association with Avidya (ignorance). This qualification allows it to be called 'Sat' (Existence) and become 'graspable by the intellect,' taking form through the 'Omkar.' From this expressible Brahman, a cosmic evolution unfolds: the Unmanifest (Avyakta) emerges, from which the Great Principle (Mahat-tattva) arises. Egoism is born from this, followed by the five Tanmatras, the five great elements, and ultimately, the entire world is born from the womb of these elements.