Read the fourth stanza from "Mutability.”

It is the same!—For, be it joy or sorrow,
The path of its departure still is free:
Man’s yesterday may ne’er be like his morrow;
Nought may endure but Mutability.

What is emphasized by Shelley’s metaphorical statement that "the path of its departure still is free”?

No path is ever the same.
Time passes by very quickly.
Emotions are ever changing.
All people feel joy and sorrow.