Aristotle described the world as a place of change and movement, where every effect has a cause and every cause an effect.

The leaf falls from the tree because of a gust of wind shakes it loose. The gust of wind blows because a storm is brewing. A storm is brewing because a warm front and a cold front collide and cause turbulence. And so on.

But, Aristotle asked, how was this chain of events set in motion?

He reasoned that there must have been a first cause, an Unmovable Mover. This force would be unchanging and unmoving, yet causing all other things to move.

The cool, creeping autumn air sparks such questions in our minds. At night, we close the old, creaking windows against cool air. We look out to see flocks of birds circling restlessly in whirls of dark wings. When we rise in the morning for work, everything is black as pitch.

Today, in the bright orange light of late afternoon, I went for a run on the Greenway. As I crossed the bridge, I peered down at the water and saw a fisherman. He wore waders and his white-bearded face peered from beneath a gray cloth hat. He cast his line and slowly reeled it in, with an air of quiet serenity.

One would imagine he’d stood there all the ages of time, holding his pole and smiling at the river rushing by.