Temporality
It is said, "All our attachments and joys are temporal," and "you can't take anything with you when you die." Such advice achieves little, as we do not understand the meaning of temporality. We understand it to mean "existing for a limited time," so we redouble our efforts to enjoy what we have, while we have it.
But temporality concerns the nature of things to be always changing. Things do not exist for even a moment before they have changed: so it is impossible to posess anything at all. You see, temporal means not real.