“By cultivating in mind that this human life is so hard to find
Yet has no time to spare,
preoccupations with this life will cease.”
From The Three Principal Aspects of the Path by Je Tsong Khapa
As translated in: The Three Principal Aspects of the Path by Lama Tsongkhapa. Translated by Thubten Jinpa, Ph.D. PDF available from the Institute of Tibetan Classics.