the end of time

Our concept of time comes from the cycles of the sun and moon. Our modern concept of time is linear in scope. However, the sun and moon are distinctly cyclical in action. So, there're really two concepts of time which the ancient Egyptians articulated as neheh and djet. 

neheh and djet time symbolized at Denderah

To the natural philosopher, time is inherently cyclical in its natural state. To the modern mind that is a conundrum as we are conditioned to believe everything has a beginning as well as perhaps an end.