All our tomorrow’s yesterdays
Must at some time have been today.
And all our todays that were now
Must by now have passed away.
But the todays that are still tomorrows
Cannot yet be yesterday,
For the present never stops moving,
Both forwards and backwards each day.
So all we can do when contemplating
Time, and the part it might play,
In measuring the span of our lives
Is to change the unchanging changes today.