Yesterday you were you, and tomorrow you will be too.
Each day may feel the same, or each day may feel completely different.
Somehow you are you.
You have some identity, a truth, a being that does not go away.
Your doing can not undo this being.
On the cellular level your body sheds and regrows, from the neurons in your brain to the skin on your flesh.
And yet you are still you.
Food that you eat gets transformed into your energy, muscle, fat, and waste.
For a moment it is part of you, and then it is gone.
Air passes through your lungs.
For a moment it is part of you, and then it is gone.
Breathing in, you know who you are.
Even if just for a moment.