Without gaining certainty in primordial purity, merely an impassioned thought of a ground that is neither existent nor nonexistent will bring you nowhere. If you hold onto such a ground, which is empty of both existence and non-existence, as separate and established by its own essence, whether it is called the inconceivable Self, Brahma, Visnu, Īśvara, wisdom, etc., it is merely a different name for a similar [mistaken] meaning. The abiding reality that is free from the four extremes — the luminous clarity of the Great Perfection which is realised reflexively — is not at all like that.

-- Mipham Rinpoche