When we except that both what we create and ourselves are transient, life become better. Concentrate on the now.
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Edit: not sure which reply to reply to, so commenting here.
My badly made point was that trying ourselves to insure the longevity of something we create is not the best use of our time and resources.
If we create something of value, and it means something to other people, it will spread, and it will be saved for the future and future generations.
Society saving things for the future is essential, and we generally do a good job of it.