" ... And suddenly he thought, I'm the abnormal one now. Normalcy was a
majority concept, the standard of many and not the standard of just
one man.

Abruptly that realization joined with what he saw on their faces --
awe, fear, shrinking horror -- and he knew that they were afraid of
him. To them he was some terrible scourge they had never seen, a
scourge even worse than the disease they had come to live with. He was
an invisible spectre who had left for evidence of his existence the
bloodless bodies of their loved ones. And he understood what they felt
and did not hate them. His right hand tightened on the tiny envelope
of pills. So long as the end did not come with violence, so long as it
did not have to be a butchery before their eyes...

Robert Neville looked out over the new people of the earth. He knew he
did not belong to them; he knew that, like the vampires, he was
anathema and black terror to be destroyed. And, abruptly, the concept
came, amusing to him even in his pain.

A coughing chuckle filled his throat. He turned and leaned against the
wall while he swallowed the pills. Full circle, he thought while the
final lethargy crept into his limbs. Full circle. A new terror born in
death, a new superstition entering the unassailable fortress of
forever.

I am legend. "

― Richard Matheson , I Am Legend and Other Stories