EN
The text explains that the separation between Jeeva and Brahma is not real; it is caused by Avidya (ignorance). We mistake the reflection for the reality. Just as a mirror reflects the sun, the Consciousness (Brahma) reflects off the intellect, creating the appearance of an individual "I".
If you find a high-quality Jeeva-Brahma-Aikya-Vedanta-Rahasyam PDF, it should contain the following structure:
The central thesis of this text is the Mahavakya (Great Saying) from the Chandogya Upanishad: