At present we have this rare and good human life of freedom and fortune, but it won’t last forever. We are certain to die and don’t know when. At death nothing at all but our spiritual practice will be of any use to us. That is the only thing worth doing—everything else is a futile waste of energy. We tire ourselves for the sake of reward and reputation and in our search for the kind of companions we prefer, but we can take none of these with us when we die. They must be left behind and only the imprints of negative actions we have performed in the process of trying to acquire them accompany us to our next rebirth. This is not hard to understand, but we must remember it and think about it till it affects the way we think and feel.
From Atisha's Lamp for the Path to Enlightenment, by Geshe Sonam Rinchen, edited and translated by Ruth Sonam, page 31.