In the beginning, you should be pursued by the fear of birth and death, like a deer escaping from a trap. In the middle, you should have nothing to regret, even if you die at this moment, like a peasant who has worked his land with care. In the end, you should be happy, like someone who has completed an immense task ..... The most important thing to know is that there is no time to lose, as if an arrow had hit a vital spot in your body.

-- Gampopa