"Impermanence is swift; life-and-death is the vital matter." - Zen Master Eihei Dōgen (永平道元; Japan, AD 1200 – 1253)
"The whole future lies in uncertainty: live immediately." - Seneca the Younger (Rome, 4 BC – AD 65). Seneca taught practical steps by which one might confront life's problems. In particular, he considered it important to confront one's own mortality. The discussion of how to approach death dominates many of his letters.