This World Quotes (page 48)
For many years I've been ashamed, mortally ashamed, of having been, even with the best intentions, even at many removes, a murderer in my turn. As time went on I merely learned that even those who were better than the rest could not keep themselves nowadays from killing or letting others kill, because such is the logic by which they live; and that we can't stir a finger in this world without the risk of bringing death to somebody.
Albert Camus
You have noticed that the truth comes into this world with two faces. One is sad with suffering, and the other laughs; but it is the same face, laughing or weeping. When people are already in despair, maybe the laughing face is better for them; and when they feel too good and are too sure of being safe, maybe the weeping face is better for them to see.
Black Elk