“Practitioners have always understood impermanence as the cornerstone of Buddhist teachings and practice. All that exists is impermanent; nothing lasts. Therefore nothing can be grasped or held onto. When we don’t fully appreciate this simple but profound truth we suffer, as did the monks who descended into misery and despair at the Buddha’s passing. When we do, we have real peace and understanding, as did the monks who remained fully mindful and calm.
As far as classical Buddhism is concerned, impermanence is the number one inescapable, and essentially painful, fact of life. It is the singular existential problem that the whole edifice of Buddhist practice is meant to address. To understand impermanence at the deepest possible level (we all understand it at superficial levels), and to merge with it fully, is the whole of the Buddhist path.
The Buddha’s final words express this: Impermanence is inescapable. Everything vanishes. Therefore there is nothing more important than continuing the path with diligence. All other options either deny or short-shrift the problem.”
Exert “Impermanence is Buddha Nature” by Norman Fischer| Lion’s Roar