A river grows wider the farther it flows,
and its water is never the same as before.
So too the soul: it expands as it travels,
Though to your eyes, it wears the same name.
Rumi, Masnavi III, 1400-1402

We depend on change in order to live, so acquaint yourself with the fact that it’s all inconstant
Pleasure isn’t for sure; pain isn’t for sure; happiness isn’t for sure; stillness isn’t for sure; distraction isn’t for sure.
Whatever arises, you should tell it: Don’t try to fool me. You’re not for sure
Ajahn Chah