change.

"When we say things like "people don't change" it drives scientists crazy
because change is literally the only constant in all of science. 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 things 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
lifetime is permanent. Change is constant. How we experience change
that's 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."