Your common sense is nothing more than the voices of thousands and thousands of these ghosts from the past.

It is within you that the ghosts acquire voices.

Through our sentences and paragraphs long-gone ghosts still have their say within the collective mind.

I am half inclined to think we are all ghosts, Mr. Manders. It is not only what we have inherited from our fathers and mothers that exists again in us, but all sorts of old dead ideas and all kinds of old dead beliefs and things of that kind. They are not actually alive in us; but there they are dormant, all the same, and we can never be rid of them. Whenever I take up a newspaper and read it, I fancy I see ghosts creeping between the lines. There must be ghosts all over the world. They must be as countless as the grains of the sands, it seems to me. And we are so miserably afraid of the light, all of us.

“Hey!” the people cried in their dreams. “Give us back our ghosts!” for ghosts are as much a part of a community as its plumbing or its library, for how can a community be without its memories?

Ghosts are not the souls of the dead, but the souls of people written out of history when history changes.

Crowds of silent voices whisper in our ears, transforming the nature of what we see and hear. Some are those of childhood authorities and heroes; others come from family and peers. The strangest emerge from beyond the grave.

you imagine there is nothing within, and indeed there are many ghosts, bones given up to the land. They stand here and there against the sky, and you approach them for a longer time than you expect. They belong in the distance; it is their domain.

"The law of gravity and gravity itself did not exist before Isaac Newton." ...and what that means is that that law of gravity exists nowhere except in people's heads! It 's a ghost!"
Mind has no matter or energy but they can't escape its predominance over everything they do. Logic exists in the mind. numbers exist only in the mind. I don't get upset when scientists say that ghosts exist in the mind. it's that only that gets me. science is only in your mind too, it's just that that doesn't make it bad. or ghosts either."
Laws of nature are human inventions, like ghosts. Law of logic, of mathematics are also human inventions, like ghosts."
...we see what we see because these ghosts show it to us, ghosts of Moses and Christ and the Buddha, and Plato, and Descartes, and Rousseau and Jefferson and Lincoln, on and on and on. Isaac Newton is a very good ghost. One of the best. Your common sense is nothing more than the voices of thousands and thousands of these ghosts from the past."

We're not talking about dead people, we're talking about the aliens; of their ghosts!

Are there other Librarian ghosts here?" she asked.
"Ghosts? Yes, I suppose that's the best word for it. Collections of memories, maybe. We are all the sum of our memories, after all.

Ghosts! […] I almost think we are all of us ghosts. It is not only what we have inherited from our father and mother that ‘walks’ in us. It is all sorts of dead ideas, and lifeless old beliefs, and so forth. They have no vitality, but they cling to us all the same, and we cannot shake them off. Whenever I take up a newspaper, I seem to see ghosts gliding between the lines. There must be ghosts all the country over, as thick as the sands of the sea. And then we are, one and all, so pitifully afraid of the light.

Almost every reality you "know" at any given second is a mere ghost held in memory.

You're from the isle of ghosts and, as you know, there are ghosts walking around all over the place over there. Loads of people have seen them, heard a voice or felt the cold temperature. I believe that they are between here and there, that they exist between the fourth and the fifth dimension and that they visit us frequently.