In considering today’s explanation of the first part of the sutra, we should reflect on the idea that it is very rare to hear these teachings, so we need to cherish this opportunity. If not, we might miss it. We might think that we should experience mundane things first, such as our professional work or enjoying the riches of the world, and then later when we are older, we will practice. But this way of thinking is not correct, because death does not wait until you are old to arrive at your doorstep. You might die at any time.

~The Gyalwang Karmapa Unlocks the Door to the Heart of Wisdom Sutra

http://the17thkarmapa.blogspot.sg/2016/08/the-gyalwang-karmapa-unlocks-door-to.html