Brahma, the Supreme Absolute, separated into male and female, and such creates and sustains the universe. This duality creates heaven and earth and the winds that move everything, and when a cold wind meets a hot on a summer day, the power is evident. Duality such as yes and no, good and bad, high and low, here and there, this and that, and so on, give people the ability to think, because without duality there is nothing to compare. Duality is essential for life, but it causes an illusion that must be overcome to attain the Heavenly State, and that is the crucial part of the teaching. The breath is also divided, but by mastering inhalation and exhalation, the illusion is overcome.
Here is a verse from the Veda for sacrificing the ego to be with the Eternal One.
When the ego falls the divided is sacrificed to be with the Eternal One for all, to be mighty for this to hear, and to see in the light to be great standing with the vital force and delightfully helping all people.