“mercy, I think, doesn't the human race know anything about mercy?”

Fiction, The Call of Cthulhu (1926)
Context: The most merciful thing in the world, I think, is the inability of the human mind to correlate all its contents. We live on a placid island of ignorance in the midst of black seas of infinity, and it was not meant that we should voyage far. The sciences, each straining in its own direction, have hitherto harmed us little; but some day the piecing together of dissociated knowledge will open up such terrifying vistas of reality, and of our frightful position therein, that we shall either go mad from the revelation or flee from the light into the peace and safety of a new dark age.

Source: Master of Love and Mercy: Cheng Yen, p. vi

The Decline and Fall of Science (1976)

Book One in 'Schizophrenia, as Predicted', B/O
The Master and Margarita (1967)

Source: The Secret Scripture

Source: World Made By Hand (2008), Chapter 65, p. 315–316

A quel pietoso fonte, onde siam tutti,
S'assembra ogni beltà che qua si vede,
Più c'altra cosa alle persone accorte;
from sonnet "Veggio nel tuo bel viso, Signor mio"
Translated by Luciano Rebay, Invitation to Italian Poetry http://books.google.com/books?id=zAnjAbsgY0gC&pg=PA77 (1969), p. 77
Variant translations:
To those who are wise, nothing more resembles that merciful spring whence all derive than every beauty to be found here;
Translated by Christopher Ryan, The poetry of Michelangelo: An Introduction http://books.google.com/books?id=Iot1KpxQJpsC&pg=PA103 (1988), p. 103
Every beauty which is seen here below by persons of perception resembles more than anything else that celestial source from which we all are come.

Source: Burnt Offerings

Source: Daughter of Fortune