Every cell in the human body regenerates, on average, every seven years. Like snakes, in our own way, we shed our skin. Biologically we’re brand new people. We may look the same, we probably do. The change isn’t visible, at least not on most of us but we're all changed completed forever.
When we say things like, “People don’t change,” it drives scientists crazy because change is literally the only constant. Energy, matter, it’s always changing, morphing, merging, growing, dying. It’s the way people try not to change that’s unnatural. The way we cling to what things were instead of letting them be what they are. The way we cling to old memories instead of forming new ones. The way we insist on believing despite every scientific indication that anything in this life time is impermanent. Change is constant. How we experience change:- that is up to us. It can feel like death or it can feel like a second chance at life. If we open our fingers, loosen our grips, go with it. It can feel like pure adrenaline. Like at any moment, we can have another chance at life. Like at any moment we can be born all over again.
... Grey's Anatomy, Season 7, Ep 1