What does the text mean by the 'State of Oneness' and 'I-ness', and what are the results of attaining it?

The "State of Oneness" described in Chapter 4 is a profound spiritual realization where the feeling of duality is completely discarded. In this state, an individual perceives everything in the universe, both moving and unmoving, as being Brahman by nature. This leads to the understanding that "the glory of the universe is our own." The text further explains that when one achieves this "I-ness" and realizes "I am everything," the result is supreme happiness and the attainment of supreme devotion. As Chapter 4 elaborates, a person in this state has no one to be at enmity with and no reason to be afraid, because they no longer perceive anything as separate or "other" from themselves.