Shankaracharya's Subtle Indication, Clarity Dawns in the Intellect

Upanishad says well thought out teachings, we take the teachings and they think through it well. Clarity dawns in the intellect at that time. So there is conviction, there is clarity, there is tremendous change in our perspective. This is called Brahma Kaaravriti, modification of the intellect in the form I am Brahman.