We live in snippits too quick for thought.

On the other hand the immediate present is prolonged according as nature presents itself to us in an aspect of unbroken rest.

Any change in nature provides ground for a differentiation among durations so as to shorten the present.

But there is a great distinction between self-change in nature and change in external nature.

Self-change in nature is change in the quality of the standpoint of the percipient event.