ICHIGO ICHIE

** Only once **

Ichi-go ichi-e (Japanese: 一期一会, pronounced [it͡ɕi.ɡo it͡ɕi.e], lit. "one time, one meeting") is a Japanese four-character idiom (yojijukugo) that describes a cultural concept of treasuring the unrepeatable nature of a moment. The term has been roughly translated as "for this time only", and "once in a lifetime". The term reminds people to cherish any gathering that they may take part in, citing the fact that any moment in life cannot be repeated; even when the same group of people get together in the same place again, a particular gathering will never be replicated, and thus each moment is always a once-in-a-lifetime experience.[1] The concept is most commonly associated with Japanese tea ceremonies,
https://en.wikipedia.org/wiki/Ichi-go_ichi-e​

See also an article by Hector Garcia and Francesc Miralles , authors of Ikigai 
www.mindbodygreen.com/articles/what-is-ichigo-ichie-10-rules-of-the-japanese-way-to-happiness

“I shall pass this way but once; any good, therefore, that I can do or any kindness I can show to any human being, let me do it now. Let me not defer nor neglect it, for I shall not pass this way again.”
                                                                                             ― Ralph Waldo Emerson