impermanence

“The Hindu scriptures speak of the body as a machine fraught with six delusive deficiencies: ‘It exists; it is born; it grows; it changes; it decays; and it is completely annihilated.’ Yet most human beings expect permanent happiness from this impermanent body.”
It’s not impermanence per se, or even knowing we’re going to die, that is the cause of our suffering, Rather, it’s our resistance to the fundamental uncertainty of our situation. Our discomfort arises from all of our efforts to put ground under our feet, to realize our dream of constant okayness. When we resist change, it’s called suffering.