Physicists have long struggled to understand what time really is. In fact, they are not even sure it exists at all. In their quest for deeper theories of the universe, some researchers increasingly suspect that time is not a fundamental feature of nature, but rather an artefact of our perception."
It is not reality that has a time flow, but our very approximate knowledge of reality. Time is the effect of our ignorance.
- New Scientist January 2008
The persistent illusion of ego is also due to ignorance about the nature of reality.