Salman Rushdie turns a marvelous phrase in Haroun and the Sea of Stories, as Rashid the genius-storyteller (whose nickname is The Shah of Blah, and who resembles Rushdie not a little) dips into magical "Oceans of Notions" to come up with his fantastic tales. When his story-ocean runs dry he loses his creativity ... and that's a central theme of the novel.
What grabs me and pins me down about that image is Ocean itself --- such a marvelous, overwhelming, incontrovertible fact --- unchanged and ever-changing, bounded and semi-infinite --- like life. Oceanic metaphors are among the most powerful I know. Among my favorites:
Charles Dickens's comment in A Christmas Carol, about human duty:
"Mankind was my business. The common welfare was my business; charity, mercy, forbearance, and benevolence were all my business. The dealings of my trade were but a drop of water in the comprehensive ocean of my business!"
Beethoven's words about Johann Sebastian Bach (punning on JSB's surname):
"This is not a brook, this is an ocean!" ("Das ist nicht ein Bach, das ist ein Meer!")
Albert Schweitzer's thoughts on humanitarianism:
"Of all the will toward the ideal in mankind only a small part can manifest itself in public action. All the rest of this force must be content with small and obscure deeds. The sum of these, however, is a thousand times stronger than the acts of those who receive wide public recognition. The latter, compared to the former, are like the foam on the waves of a deep ocean."
Isaac Newton's modest self-description:
"I do not know what I may appear to the world; but to myself I seem to have been only like a boy playing on the seashore, and diverting myself in now and then finding a smoother pebble or a prettier shell than ordinary, whilst the great ocean of truth lay all undiscovered before me."