Verdanta has a full, very complex epistemology, six sources of knowledge. The sanscrit word for that is prama. To exist, a thing must be knowable. All existent things must be in some sense knowable. So remember these terms, pramata, pramana, pramea and prama. Remember, five steps to discuss what the self has. Stage one, existence depends on knowability.
Swami Sarvapriyananda teaches one of the shortest and most profound upanishads accompanied by Gaudapada's Karika. This lecture covers Mantra 2.