In Lama Tsongkhapa’s Foundation of all Good Qualities, he succinctly says:

This body and life is like a bubble of water. Remember death for we perish so quickly.

Many of us that practice within the Gelug tradition likely recite the Foundation of All Good Qualities on a daily basis. I think just getting this one realization about death and impermanence is a considerable achievement. In this interesting video, Lama Zopa Rinpoche talks about impermanence and the fleeting nature of life. I always enjoy his teachings because they have a very deep meditative quality to them