How does Brahman, which is beyond the senses, become expressible and take form?

According to Chapter 50, Brahman is originally beyond the senses, but it becomes 'qualified' (shabal) through its association with Avidya, or ignorance. This qualification allows it to be given the name 'Sat' (Existence), thus attaining expressibility. The text states that speech then makes it 'graspable by the intellect.' Once graspable, it enters the mind and takes form through the 'Omkar.' From this expressible Brahman, the Unmanifest emerges, which then gives rise to the Great Principle (Mahat-tattva), egoism, and ultimately the entire world.