In his beautiful contribution to NPR's This I Believe series, Thomas Mann speaks to the value of impermanence:
What I believe, what I value most, is transitoriness.
But is not transitoriness — the perishableness of life — something very sad? No! It is the very soul of existence. It imparts value, dignity, interest to life. Transitoriness creates time — and “time is the essence.” Potentially at least, time is the supreme, most useful gift.
Read more here.