Mono no aware
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Mono no aware (もののあはれ?), literally "the pathos of things", and also translated as "an empathy toward things", or "a sensitivity to ephemera", is a Japanese term for the awareness of impermanence (無常 mujō?), or transience of things, and both a transient gentle sadness (or wistfulness) at their passing as well as a longer, deeper gentle sadness about this state being the reality of life.

Omar Khayyám was a Persian polymath, mathematician, philosopher, astronomer, physician, and poet.

“The Moving Finger writes; and, havving writ, Moves on: nor all thy Piety nor Wit Shall lure it back to cancel half a Line, Nor all thy Tears wash out a Word of it.” Omar Khayyám