Octave Mirbeau said this quote

While I was an honorable man in her eyes, she did not love me. But the minute she understood what I was, when she breathed the true and foul odor of my soul, love was born in her – for she does love me! Well, well! There is nothing real, then, except evil.

~ Octave Mirbeau

Wherever he goes, whatever he does, he will always see that word: murder—immortally inscribed upon the pediment of that vast slaughterhouse—humanity.

~ Octave Mirbeau

Everything she heard, everything she saw seemed to be in disagreement with her own manner of understanding and feeling. To her, the sun did not appear red enough, the nights pale enough, the skies deep enough. Her fleeting conception of things and beings condemned her fatally to a perversion of her senses, to vagaries of the spirit and left her nothing but the torment of an unachieved longing, the torture of unfulfilled desires.

~ Octave Mirbeau

I understood that the law of the world was strife; an inexorable, murderous law, which was not content with arming nation against nation but which hurled against one another the children of the same race, the same family, the same womb. I found none of the lofty abstractions of honor, justice, charity, patriotism of which our standard books are so full, on which we are brought up, with which we are lulled to sleep, through which they hypnotize us in order the better to deceive the kind little folk, to enslave them the more easily, to butcher them the more foully.

~ Octave Mirbeau