“I made a list of things that I might consider sin if the concept of sin were valid:
Number 1: Credulity, gullibility. I'd say that's a sin.
Voluntary willful ignorance. I'd say that's a sin.
Letting fear prevent you from understanding reality. I'd call that a sin.
Limiting the rights and freedoms of others in order to make them abide by your standards. That's a sin.
Sacrificing the mental, emotional and physical well-being of a child in deference to your religion. That's a sin.
Wasting the one and only life that you know you're going to have, worrying about and working for an afterlife that somebody told you might be there. That's a sin.”

Source: Letter 99, Paragraph 13. Erika Bullmann Flores, Tr. from: <cite>Dr. Martin Luther's Saemmtliche Schriften</cite>Dr. Johann Georg Walch http://en.wikipedia.org/wiki/Johann_Georg_Walch Ed. (St. Louis: Concordia Publishing House, N.D.), Vol. 15, cols. 2585-2590. http://www.iclnet.org/pub/resources/text/wittenberg/luther/letsinsbe.txt
Context: If you are a preacher of mercy, do not preach an imaginary but the true mercy. If the mercy is true, you must therefore bear the true, not an imaginary sin. God does not save those who are only imaginary sinners. Be a sinner, and let your sins be strong (sin boldly), but let your trust in Christ be stronger, and rejoice in Christ who is the victor over sin, death, and the world. We will commit sins while we are here, for this life is not a place where justice resides. We, however, says Peter (2. Peter 3:13) are looking forward to a new heaven and a new earth where justice will reign.

Source: The Sickness Unto Death: A Christian Psychological Exposition for Upbuilding and Awakening

As quoted in "Samuel Beckett Talks About Beckett" by John Gruen, in Vogue, (December 1969), p. 210
Comparable to "The tragic figure represents the expiation of original sin, of the original and eternal sin of him and all his 'soci malorum,' the sin of having been born. 'Pues el delito mayor / Del hombre es haber nacido.'" from his essay Proust, quoting Pedro Calderón de la Barca's La vida es sueño (Life is a Dream).

The immediate future: Lectures delivered in Queen's Hall, London, 1911 http://books.google.co.in/books?id=VGNbAAAAMAAJ, p. 32

Source: Towards Evening (1889), p. 34

Book II, ch. 3 (trans. Constance Garnett)
The Elder Zossima, speaking to a devout widow afraid of death
The Brothers Karamazov (1879–1880)
Context: If you are penitent, you love. And if you love you are of God. All things are atoned for, all things are saved by love. If I, a sinner even as you are, am tender with you and have pity on you, how much more will God have pity upon you. Love is such a priceless treasure that you can redeem the whole world by it, and cleanse not only your own sins but the sins of others.

The Satanic Bible (1969)

"Portrait of the Artist as a Prematurely Old Man" (1959)