In his last sermon, Buddha summarized a life-time of teachings in a few pithy paragraphs. Even if I were to live in the world for as long as a kalpa, our coming together would have to end. Do not be troubled, for this is the nature of life. Diligently practicing right effort, you must seek liberation immediately. Within the light of wisdom, destroy the darkness of ignorance.
Nothing is secure.
Everything in this life is precarious. Always wholeheartedly seek the way of liberation. All things in the world, whether moving or non-moving, are characterized by disappearance and instability. Time is passing. I am about to cross over.