Philosophy : the basics (Fifth Edition, 2013), Introduction
“This divergence and perversion of the essential question is most striking in what goes today by the name of philosophy. There would seem to be only one question for philosophy to resolve: What must I do? Despite being combined with an enormous amount of unnecessary confusion, answers to the question have at any rate been given within the philosophical tradition on the Christian nations. For example, in Kant´s Critique of Practical Reason, or in Spinoza, Schopenhauer and specially Rousseau.
But in more recent times, since Hegel´s assertion that all that exists is reasonable, the question of what one must do has been pushed to the background and philosophy has directed its whole attention to the investigation of things as they are, and to fitting them into a prearranged theory. This was the first step backwards.
The second step, degrading human thought yet further, was the acceptance of the struggle for existence as a basic law, simply because that struggle can be observed among animals and plants. According to this theory the destruction of the weakest is a law which should not be opposed. And finally, the third step was taken when the childish originality of Nietzsche´s half-crazed thought, presenting nothing complete or coherent, but only various drafts of immoral and completely unsubstantiated ideas, was accepted by the leading figures as the final word in philosophical science. In reply to the question: what must we do? the answer is now put straightforwardly as: live as you like, without paying attention to the lives of others.
If anyone doubted that the Christian world of today has reached a frightful state of torpor and brutalization (not forgetting the recent crimes committed in the Boers and in China, which were defended by the clergy and acclaimed as heroic feats by all the world powers), the extraordinary success of Nietzsche´s works is enough to provide irrefutable proof of this.
Some disjointed writings, striving after effect in a most sordid manner, appear, written by a daring, but limited and abnormal German, suffering from power mania. Neither in talent nor in their basic argument to these writings justify public attention. In the days of Kant, Leibniz, or Hume, or even fifty years ago, such writings would not only have received no attention, but they would not even have appeared. But today all the so called educated people are praising the ravings of Mr. N, arguing about him, elucidating him, and countless copies of his works are printed in all languages.”
Source: What is Religion, of What does its Essence Consist? (1902), Chapter 11
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Leo Tolstoy 456
Russian writer 1828–1910Related quotes

The Myth of Sisyphus and other essays by Albert Camus, An Absurd Reasoning : Absurdity and Suicide p. 3 (1942, 1955)
Absurdity and Suicide
The Myth of Sisyphus (1942), An Absurd Reasoning
Context: There is but one truly serious philosophical problem and that is suicide. Judging whether life is or is not worth living amounts to answering the fundamental question of philosophy. All the rest – whether or not the world has three dimensions, whether the mind has nine or twelve categories – comes afterwards. These are games; one must first answer. And if it is true, as Nietzsche claims, that a philosopher, to deserve our respect, must preach by example, you can appreciate the importance of that reply, for it will precede the definitive act. These are facts the heart can feel; yet they call for careful study before they become clear to the intellect. If I ask myself how to judge that this question is more urgent than that, I reply that one judges by the actions it entails. I have never seen anyone die for the ontological argument.
Source: Leisure, the Basis of Culture (1948), The Philosophical Act, p. 63

J.D. Bernal (1937) "Dialectical Materialism and Modern Science" in: Science and Society, Volume II, No. 1, Winter 1937; Online ( here http://www.marxists.org/archive/bernal/works/1930s/dsams.htm) on Marxists Internet Archive (2002).

System of Transcendental Philosophy (1800)

Quoted by Frederic Prokosch in Voices: A Memoir (1983)

Source: The Journal of Philosophy, Vol. 7, (1910), p. 407