The title is a reference to the pre-Socratic philosopher Heraclitus, who was known as The Obscure.

The roots of process thinking can be found in the Greek philosopher Heraclitus.

Perhaps the Greek philosopher Heraclitus, who seems to have inspired the movie's title, said it best: You can't step into the same river twice.

But you cannot step in the same river twice, as the philosopher Heraclitus put it.

Today's Columns You never swim in the same river twice, the philosopher Heraclitus said.

Five hundred years before Christ was born, the Greek philosopher Heraclitus told his students that "everything changes except the law of change".

Dialectics and its study was derived from Hegel who had studied the Greek philosopher Heraclitus.

McKenna always regarded the Greek philosopher Heraclitus as his favorite philosopher.

The Greek philosopher Heraclitus attempted to solve the paradox by introducing the idea of a river where water replenishes it.

Melvyn Bragg and his guests discuss the ancient Greek philosopher Heraclitus.