Guru Rinpoche said:
“Human beings don't think of death. A man's life is like a pile of chaff or a feather on a mountain pass. The demon Lord of Death come suddenly, like an avalanche or a storm.
Disturbing emotions are like straw catching fire. Your life-span decreases like the shadows of the setting sun.
All sentient beings of the three realms entangle themselves in their self-created black snake of anger.
They pierce themselves with the horns of their self- created red ox of desire.
They obscure themselves with their self-produced dense darkness of dullness.
They chain themselves to their self-created cliff of conceit.
They mangle themselves with their self-created jackal of envy.
People don't notice that they fail to escape the five dangerous defiles of disturbing emotions. They do anything to experience the sarnsaric pleasures of just this life.
This life is crossed in a brief moment, but sarnsara is endless.
What will you do in the next life? Also, the length of this life is not guaranteed: the time of death lies uncertain, and like a convict taken to the scaffold, you draw closer to death with each step.
All beings are impermanent and die. Haven't you heard about the people who died in the past? Haven't you seen any of your relatives die?
Don't you notice that we grow old? And still, rather than practicing the Dharma, you forget about past grief.
Rather than dreading future misery, you ignore the suffering of the lower realms. Chased by temporary circumstances, tied by the rope of dualistic fixation, exhausted by the river of desire, caught in the web of sarnsaric existence, held captive by the tight shackles of karmic ripening - even when the tidings of the Dharma reach you, you still cling to diversions and remain careless.
Is it that death doesn't happen to people like you? I pity all sentient beings who think in this way!