Consider the Koran... this ...

Consider the Koran... this wretched book was sufficient to start a world-religion, to satisfy the metaphysical need of countless millions for twelve hundred years, to become the basis of their morality and of a remarkable contempt for death, and also to inspire them to bloody wars and the most extensive conquests. In this book we find the saddest and poorest form of theism. Much may be lost in translation, but I have not been able to discover in it one single idea of value.
Consider the Koran... this wretched book was sufficient to start a world-religion, to satisfy the metaphysical need of countless millions for twelve hundred years, to become the basis of their morality and of a remarkable contempt for death, and also to inspire them to bloody wars and the most extensive conquests. In this book we find the saddest and poorest form of theism. Much may be lost in translation, but I have not been able to discover in it one single idea of value.
 Arthur Schopenhauer

Quotes from the same author

Every man takes the limits of his own field of vision for the limits of the world.
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 Arthur Schopenhauer
In action a great heart is the chief qualification. In work, a great head.
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 Arthur Schopenhauer
If children were brought into the world by an act of pure reason alone, would the human race continue to exist? Would not a man rather have so much sympathy with the coming generation as to spare it the burden of existence, or at any rate not take it upon himself to impose that burden upon it in cold blood?
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 Arthur Schopenhauer
A man of business will often deceive you without the slightest scruple, but he will absolutely refuse to commit a theft.
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 Arthur Schopenhauer
The first forty years of life give us the text; the next thirty supply the commentary on it.
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 Arthur Schopenhauer