“Is it true that your life passes before your eyes before you die?”
Yes.
“Ghastly thought, really.” Rincewind shuddered. “Oh, gods, I’ve just had another one. Suppose I am about to die and this is my whole life passing in front of my eyes?”
I think perhaps you do not understand. People’s whole lives do pass in front of their eyes before they die. The process is called “living.”

Terry Pratchett (1948-2015) English author

Discworld No. 22, The Last Continent [Death and Rincewind] (1999)
    (Source)

Variants and paraphrases:

It is often said that before you die your life passes before your eyes. It is in fact true. It's called living.

It is said that your life flashes before your eyes just before you die. That is true, it’s called Life.