“Nothing in Christianity is original.”

Letter to Pope Pius XI (1933) as translated in Inside the Vatican (2003), p. 27
Context: As a child of the Jewish people who, by the grace of God, for the past eleven years has also been a child of the Catholic Church, I dare to speak to the Father of Christianity about that which oppresses millions of Germans. For weeks we have seen deeds perpetrated in Germany which mock any sense of justice and humanity, not to mention love of neighbor. For years the leaders of National Socialism have been preaching hatred of the Jews. But the responsibility must fall, after all, on those who brought them to this point and it also falls on those who keep silent in the face of such happenings.
Everything that happened and continues to happen on a daily basis originates with a government that calls itself "Christian." For weeks not only Jews but also thousands of faithful Catholics in Germany, and, I believe, all over the world, have been waiting and hoping for the Church of Christ to raise its voice to put a stop to this abuse of Christ’s name.

A Short History of Christianity (2011)

Book IV, Chapter 4, "Good Infection"
Mere Christianity (1952)

Part I : Ambiguity and Freedom
The Ethics of Ambiguity (1947)
Context: The failure described in Being and Nothingness is definitive, but it is also ambiguous. Man, Sartre tells us, is “a being who makes himself a lack of being in order that there might be being.” That means, first of all, that his passion is not inflicted upon him from without. He chooses it. It is his very being and, as such, does not imply the idea of unhappiness. If this choice is considered as useless, it is because there exists no absolute value before the passion of man, outside of it, in relation to which one might distinguish the useless from the useful. The word “useful” has not yet received a meaning on the level of description where Being and Nothingness is situated. It can be defined only in the human world established by man’s projects and the ends he sets up. In the original helplessness from which man surges up, nothing is useful, nothing is useless. It must therefore be understood that the passion to which man has acquiesced finds no external justification. No outside appeal, no objective necessity permits of its being called useful. It has no reason to will itself. But this does not mean that it can not justify itself, that it can not give itself reasons for being that it does not have. And indeed Sartre tells us that man makes himself this lack of being in order that there might be being. The term in order that clearly indicates an intentionality. It is not in vain that man nullifies being. Thanks to him, being is disclosed and he desires this disclosure. There is an original type of attachment to being which is not the relationship “wanting to be” but rather “wanting to disclose being.” Now, here there is not failure, but rather success.

Anarchism: Its Philosophy and Ideal (1896)
Context: Far be it from us not to recognize the importance of the second factor, moral teaching — especially that which is unconsciously transmitted in society and results from the whole of the ideas and comments emitted by each of us on facts and events of every-day life. But this force can only act on society under one condition, that of not being crossed by a mass of contradictory immoral teachings resulting from the practice of institutions.
In that case its influence is nil or baneful. Take Christian morality: what other teaching could have had more hold on minds than that spoken in the name of a crucified God, and could have acted with all its mystical force, all its poetry of martyrdom, its grandeur in forgiving executioners? And yet the institution was more powerful than the religion: soon Christianity — a revolt against imperial Rome — was conquered by that same Rome; it accepted its maxims, customs, and language. The Christian church accepted the Roman law as its own, and as such — allied to the State — it became in history the most furious enemy of all semi-communist institutions, to which Christianity appealed at Its origin.

Source: The Blind Watchmaker (1986), Chapter 6 “Origins and Miracles” (p. 141)

"The Holy Dimension", p. 333
Moral Grandeur and Spiritual Audacity: Essays (1997)
Context: Faith is not a thing that comes into being out of nothing. It originates in an event. In the spiritual vacancy of life something may suddenly occur that is like the lifting of a veil at the horizon of knowledge. A simple episode may open sight of the eternal. A shift of conceptions, boisterous like a tempest of soft as a breeze may swerve a mind for an instant or forever. For God is not wholly silent and man is not always deaf. God's willingness to call men to His service and man's responsiveness to the divine indications in things and events are for faith what sun and soil are for the plant.

1960s, Freedom From The Known (1969)
Context: For centuries we have been spoon-fed by our teachers, by our authorities, by our books, our saints. We say, "Tell me all about it — what lies beyond the hills and the mountains and the earth?" and we are satisfied with their descriptions, which means that we live on words and our life is shallow and empty. We are secondhand people. We have lived on what we have been told, either guided by our inclinations, our tendencies, or compelled to accept by circumstances and environment. We are the result of all kinds of influences and there is nothing new in us, nothing that we have discovered for ourselves; nothing original, pristine, clear.