“This life is as impermanent as a water bubble;
Remember how quickly it decays and death comes.
After death, just like a shadow follows the body,
The results of black and white karma follow.”
From Foundation of All Good Qualities by Je Tsong Khapa
As translated in: Included in Essential Buddhist Prayers: An FPMT Prayer Book, volume 1. Translated by Jampal Lhundrup. FPMT, Inc. Available on-line from Lama Yeshe Wisdom Archive.