“No man ever steps in the same river twice, for it’s not the same river and he’s not the same man.”
Heraclitus (540-480 B.C) was from Ephesus, and is said to have written one book. Even in antiquity, he was known for his deliberate, obscure riddles.
Heraclitus believed that the cosmos are continuously, incessantly bursting into changes. Nothing is static; not man, not universe.
Hence the remark, “You haven’t changed a bit!” is simplistic to the point of being flawed. Because we’re all changing, evolving (hopefully) into better versions of ourselves. We’re continually losing bones, flesh, blood. Gaining opinions and desires. Overcoming fears, letting go of hate, experiencing love. Need I go on?
Some things grow in us, others perish.