"Nirguna" and "Saguna" Brahman concepts of the Bhakti movement has been a baffling one to scholars, particularly the "Nirguni" tradition because it offers, states David Lorenzen, "heart-felt devotion to a God without attributes, without even any definable personality". Yet given the "mountains of "Nirguni" bhakti literature", adds Lorenzen, bhakti for "Nirguna Brahman" has been a part of the reality of the Hindu tradition along with the bhakti for "Saguna Brahman". These were two alternate ways of imagining God during the bhakti movement.