
"The Japanese concept, ichigo ichie (literally meaning 'one time, one encounter') originally comes from the tea ceremony tradition. [...] Ichigo ichie is the appreciation of the ephemeral character of any encounters with people, things or events in life. Precisely because an encounter is ephemeral, it must be taken seriously. Life, after all, is filled with things that happen only once. The realization of the 'onceness' of life's encounters and pleasures provides the foundations for the Japanese conceptualization of ikigai, and is central to the Japanese philosophy of life. When you take notice of the small details of life, nothing is repeated. Every opportunity is special. That is why the Japanese treat the tiniest detail of any ritual as if it were a question of life and death."
Ken Mogi, The Little Book of Ikigai