Nguyen Vu

“If these key points are not understood, some people will neglect clear visualization and the holding of vajra pride, and concentrate solely on the repetition of mantra. Some will hold that the deities and pure realms exist in their own right, and so even though they engage in sadhana practice they will not awaken to buddhahood. Thus, you must understand these key points!”
― Dudjom Lingpa, Buddhahood Without Meditation: A Visionary Account Known As Refining One's Perception

“Although other (yānas) assert that liberation will be achieved by renouncing the objects, one will not be bound by the mere appearances or the mind and the objects (Yul Dang Ch'os-Su sNang-Ba), but will be bound if one attaches (Zhen-Pa) to them. So it is taught (in scriptures) that one should renounce apprehension and attachment. Tilopā said: 'Appearances do not bind, but attachments do. So, Nāropa, cut off the attachments....”
― Longchen Rabjam, The Practice of Dzogchen