I remember a scene from an old Popeye cartoon, back when they made feature length cartoon for the theaters (15-30 minutes). In this scene, Popeye was chasing a mysterious creature that started up some stairs that were simply floating in the sky.
Going up the stairs Popeye noticed that as he went to the next stair the stair he just stepped from had vanished. He was now high in the air and there was no turning back, even the stair he was on was dissolving, his only choice was to move forward.
This is the nature of time, there is only the step you are standing on (which is dissolving) and the next one you will take, everything else is an illusion.
We cannot go back, nor can we stand still, our only choice is to take the next step.