Dudjom Lingpa , Buddha hood without Meditation
A Visionary Account Known as Refining Apparent Phenomena
At first one develops understanding by relying on training. Later, one develops realization by summoning forth personal experience to one's mind-stream through examination and analysis. But the situation is such that mere understanding and realization will not bring freedom; even though one has food, for example, one will not be satisfied if one does not eat it.