From the Fathers

"Time passes without stopping, and my body, even during my lifetime, constantly changes and passes on, and the whole world as is seen in its motion, also passes on, as though it were hurrying to its appointed end, like a machine set in motion. Where, then, is constancy?

Constancy is that which moves and directs all this to its purpose. The first Cause of all that is complex and created is constant, being Itself not complex, and therefore not passing, but eternal. The souls of angels and men, created after the image of the first Cause, are also constant. Everything else is like a soap bubble.

I do not lower creation by these words, but only thus speak of it in comparison with the Creator and beatified souls."

St. John of Kronstadt (My Life in Christ, Part 1; Holy Trinity Monastery pg. 16)