This is something quite dark and disturbing, and i am not sure whether it is really worth sharing, but anyway, here it is, from the pen of Russia's great novelist Dostoyevsky:

"In every man, of course, a demon lies hidden- the demon of rage, the demon of lustful heat at the screams of the tortured victim, the demon of lawlessness let off the chain, the demon of diseases that follow on vice, gout, kidney disease, and so on.

"This poor child of five was subjected to every possible torture by those cultivated parents. They beat her, thrashed her, kicked her for no reason till her body was one bruise. Then, they went to greater refinements of cruelty- shut her up all night in the cold and frost in a privy, and because she didn't ask to be taken up at night (as though a child of five sleeping its angelic, sound sleep could be trained to wake and ask), they smeared her face and filled her mouth with excrement, and it was her mother, her mother did this. And that mother could sleep, hearing the poor child's groans! Can you understand why a little creature, who can't even understand what's done to her, should beat her little aching heart with her tiny fist in the dark and the cold, and weep her meek unresentful tears to dear, kind God to protect her? Do you understand that, friend and brother, you pious and humble novice? Do you understand why this infamy must be and is permitted? Without it, I am told, man could not have existed on earth, for he could not have known good and evil. Why should he know that diabolical good and evil when it costs so much? Why, the whole world of knowledge is not worth that child's prayer to dear, kind God'! I say nothing of the sufferings of grown-up people, they have eaten the apple, damn them, and the devil take them all! But these little ones! I am making you suffer, Alyosha, you are not yourself. I'll leave off if you like."

Fyodor Dostoevsky, The Brothers Karamazov