Khenpo Sodargye
In Dharma practice, thinking of impermanence is of the highest importance. If we lack the remembrance of impermanence, we are no different from ordinary worldly people. Sometimes, we see certain Khenpos, Geshes, or other figures of high stature whose speech and behavior seem to lack the understanding of impermanence. Then, their Dharma practice will not be good either. If one lacks the contemplation of impermanence, one clings to permanence, leading to afflictions and negative karma which ultimately brings suffering.
For practitioners, the contemplation of impermanence is of the highest importance among all practices… Just as the teachings of the Kadampa masters show, when the feeling of impermanence arises in our mindstream, we no longer have much interest in worldly matters, realizing that if we do not listen, contemplate, and practice Dharma as soon as possible, this brief human life will pass by in the blink of an eye.