What is known as the revealed Buddha is this evidence of My own being. Because it has the center, the central vigor, it is the Self of everything. As it does not need any deeds, it is the Buddha since the beginning. As it is free of striving and achieving, it is since the beginning known as great. The Great Self is known as the Great Buddha. This evidence which is unborn and non-conceptual is the dimension of Reality [dharmadhatu].
-The All-Creating Mind-King Tantra