The Upanishad says 'Brahmavid Brahmaiva Bhavati' that is to say that He who knows Brahma verily becomes Brahma.
This scripture is the essence of Vedanta in Advaita Vedanta. I am a Vishista-advaitist who has gone beyond Brahma that I define as Brahma-Nature universe (Brahman) with its guna consciousness atttibutes. The Entity beynd Brahma is the Creator Sri Krishna with whom I am in total union with. So I am an avatar.