Ludwig Feuerbach libro La Esencia del Cristianismo
The Essence of Christianity
Ludwig Andreas Feuerbach fue un filósofo alemán, antropólogo, biólogo y crítico de la religión. Es considerado el padre intelectual del humanismo ateo contemporáneo, también denominado ateísmo antropológico. Para él la inmortalidad es una creación humana y constituye el germen básico de la antropología de la religión.[1]
El materialismo crítico de Feuerbach tendría un efecto profundo tanto en el pensamiento de Richard Wagner,[2] Max Stirner y Bakunin como en las teorías de Marx y Engels y, en general, en todo el denominado materialismo histórico. Wikipedia

Ludwig Feuerbach libro La Esencia del Cristianismo
The Essence of Christianity
Lecture I, Occasion and Context <br class="br"> Lectures on the Essence of Religion http://www.marxists.org/reference/archive/feuerbach/works/lectures/index.htm (1851)
Z. Hanfi, trans., in The Fiery Brook (1972), p. 54
Towards a Critique of Hegel’s Philosophy (1839)
Part III, Section 31 <br class="br"> Principles of Philosophy of the Future http://www.marxists.org/reference/archive/feuerbach/works/future/index.htm (1843)
Der Mensch ist, was er ißt. <br class="br">Die Naturwissenschaft und die Revolution [Natural science and the revolution] (1850), repeated in Das Geheimnis des Opfers, ober der Mensch ist was er ißt http://books.google.com/books?id=QYINAAAAYAAJ&pg=PA1 [The Mystery of Sacrifice, or Man is What He Eats] (1862)
“To enrich God, man must become poor; that God may be all, man must be nothing.”
Ludwig Feuerbach libro La Esencia del Cristianismo
The Essence of Christianity (1841)
“Can any good come out of Nazareth?”
This is always the question of the wiseacres and the knowing ones. But the good, the new, comes from exactly that quarter whence it is not looked for, and is always something different from what is expected. Everything new is received with contempt, for it begins in obscurity. It becomes a power unobserved.
As quoted in "Voices of the New Time" as translated by C. C. Shackford in The Radical Vol. 7 (1870), p. 329