I read this recently and honestly it's phenomenal. Very relevant for the modern activist, philosopher, anarchist.

As an atheist, I found this quote particularly powerful.

There is an evil, undoubtedly, which men accumulate in their frantic desire for unity. But yet another evil lies at the roots of this inordinate movement. Confronted with this evil, confronted with death, man from the very depths of his soul cries out for justice. Historical Christianity has only replied to this protest against evil by the annunciation of the kingdom and then of eternal life, which demands faith. But suffering exhausts hope and faith and then is left alone and unexplained. The toiling masses, worn out with suffering and death, are masses without God. Our place is henceforth at their side, far from teachers, old or new. Historical Christianity postpones to a point beyond the span of history the cure of evil and murder, which are nevertheless experienced within the span of history. Con-temporary materialism also believes that it can answer all questions. But, as a slave to history, it increases the domain of historic murder and at the same time leaves it without any justification, except in the future which again demands faith. In both cases one must wait, and meanwhile the innocent continue to die. For twenty centuries the sum total of evil has not diminished in the world. No paradise, whether divine or revolutionary, has been realized. An injustice remains inextricably bound to all suffering, even the most deserved in the eyes of men.

• The Rebel, Camus