.
Peter Bien translates:
"I am going contrary to human nature, am forsaking flesh for shadow. Life consists of flesh, of meat, and I am hungry!"
https://books.google.gr/books?id=W1...ved=0ahUKEwiYrOug8cXOAhWJXhQKHd64AB0Q6AEIGTAA
Forsaking actual, active life for its mere shadow: reading and contemplating about life, delving in its pale ghost and distant echo, dwelling in the shadows instead of living it fully, out in the open, bathing in its light.
Not an idiom that I know of; just a metaphor on the theme frequently found in Report to Greco and other works of Kazantzakis: flesh and spirit, body and soul, the struggle of man to navigate between them and find a way to balance and unify them.
In other words, what Bien translates
and Nickel says, expanded
Enough for now; the sea awaits
I'm diving in, not stranded