More than 2000 years later such metaphors seem outdated. Vastness belongs to space itself.
Today we understand that our precious little planet's oceans are finite. They have proven themselves vulnerable to humankind's disregard. We are managing to pollute the oceans.
Just how finite is illustrated quite powerfully by this image that appeared on the NASA website.
Illustration Credit & Copyright: Jack Cook, Woods Hole Oceanographic Institution, Howard Perlman, USGS
Nuclear power plants come to my mind as spectacularly bad things to build. I heard that debris from the Fukushima tsunami disaster has drifted across the Pacific. Most of it sank to the bottom of the ocean. But quite a lot of debris is now making its way to our shorelines here on the West Coast. There is concern I guess that drums of toxic waste might land here and release their contents as they pound against rocks in the surf.
So, I'll remember to say thank you to water each time I encounter it today. The stuff is as precious as life itself.