In the poem by John Donne - No Man Is an Island, the central message is that no one can exist all by themselves. In other words, there is no such thing as self-sufficiency.
He writes:
No man is an island entire of itself; every man is a piece of the continent, a part of the main; a clod to be washed away by the sea...
Another way of saying this is that everyone must depend on the company, help, comfort, idea, support, etc of others in order to have a well-rounded existence.
What is self-sufficiency?
This, in simple terms, means to be able to live alone independent of the input of others.
See the link below for about the poem - No Man is an Island:
https://brainly.com/question/15529500
