How Long Have We Been on this Journey?

A sage was asked, “How long have we been on this journey?” He replied, “Imagine a mountain three miles wide, three miles high, and three miles long. Once every hundred years, a bird flies over the mountain, holding a silk scarf in its beak, which it brushes across the surface of the mountain. The time it would take for the scarf to wear down the mountain is how long we’ve been doing this.” Article