Invisibility

Quotations
"'And now here is my secret, a very simple secret: It is only with the heart that one can see rightly; what is essential is invisible to the eye.'" -Antoine de Saint-Exupéry, The Little Prince (Translated by Katherine Woods)

"Perhaps the reason he wanted to be alone was because he felt isolated from everybody since his talk with Dumbledore. An invisible barrier separated him from the rest of the world." -J.K. Rowling, Harry Potter and the Order of the Phoenix

"As if each generation of parents commits atrocities against their children which by God's decree remain invisible to the rest of the world." -John Updike, "Flight," Pigeon Feathers

"But often now this body she wore…this body, with all its capacities, seemed nothing – nothing at all. She had the oddest sense of being herself invisible, unseen; unknown; there being no more marrying, no more having of children now, but only this astonishing and rather solemn progress with the rest of them, up Bond Street, this being Mrs. Dalloway; not even Clarissa any more; this being Mrs. Richard Dalloway." -Virginia Woolf, Mrs. Dalloway

"O Rose, thou art sick!
The invisible worm
That flies in the night,
In the howling storm,

Has found out thy bed
Of crimson joy:
And his dark secret love
Does thy life destroy." -William Blake, "The Sick Rose" (Songs of Experience)

"…All I want is to tell you stories about my life.

For each new friend we make, the past becomes an unintended
     secret.
An invisible hallway unfolds behind each friend's body, hidden from
     view by that friend's newness.
It makes me lonely." -Ken Chen, "3. The Invisible Memoir"