I once heard a tale of a man who split himself in two. The one part never changed at all; the other grew and… — Orson Scott Card

I once heard a tale of a man who split himself in two. The one part never changed at all; the other grew and grew. The changeless part was always true, the growing part was always new, and I wondered, when the tale was through, which part was me, and which was you.

Source: Wikiquote · CC BY-SA 4.0