Here is a visual to ponder:
Think of yourself as a wheel..rolling through life, throwing energy forward with each turn.
The wheel keeps on rolling rolling rolling through time and slowly starts disintegrating and breaking apart until the wheel comes to a halt (death).
Try another one:
Imagine reading a comic where you can see inside the characters mind. The metaphor for his/her mind is a dark room with a point of light in it. The vast majority of the rest is in total darkness. Then read on and see how this character goes about interacting in the world while carrying around this load of unillumined darkness.
These visuals are trying to convey the human condition.