you can't step in the same river twice

1.
Origin: Ancient Greek; used in English (global)philosophicalliterary
- A philosophical statement that everything is in constant flux; because circumstances and people continuously change, one cannot experience the exact same situation twice.
- A proverb expressing the impermanence of all things and the impossibility of returning to an identical past state.
2.
English (general)colloquialidiomatic
- Used figuratively to remark that conditions, opportunities, or relationships change over time, so one should not expect to recreate or revisit the past exactly as it was.

Examples: