One must be deeply aware of the impermanence of the world.
Coming, going, the waterbirds, don't leave a trace, don't follow a path.
If we look at the world with a deluded body and mind, we will think that our self is permanent. But if we practice correctly and return to our true self, we will realize that nothing is permanent
The recognition of the coming and going of things is a first step in training and practice.
What is reality? An icicle forming in fire.
Does a dragon still sing from within a withered tree?