It is a riddle.
It is the strongest force,
to resist your force,
and yet it is not a force.
It never accelerates,
but it is always moving.
It never rests, and
it never gets tired.
It has been defined many ways,
but no one can quite capture it.
What is it?
For anyone interested:
1. We can't say that time 'never accelerates'. According to Einstein's relativity, this is exactly what happens to the perception of time between two reference frames in relative motion (specifically, relative acceleration).
2. Likewise, we can't say it 'never rests', because in the case of anything travelling at the speed of light, photons or gauge bosons for example- there is no motion in the time dimension.
Thanks for your time!