Patricia Highsmith

He poked a finger at Ingham. "The ways of Araby are strange as her perfumes. Yes! But you are a son of the West. May your conscience let you rest! Ha-ha! That rhymes. Unintentional. Bye-bye, Howard, and God bless you!" (The Tremor of Forgery)

Books on conscience

2017 The art of turning
Kevin DeYoung
2016 Conscience: What It Is, How to Train It, and Loving Those Who Differ
Naselli and Crowley
2012 Pure Joy: Rediscover your conscience
Christopher Ash
2010 The Conscience
Robert Solomon

1996 Honesty, Morality, and Conscience
Jerry White
1994 The vanishing conscience
John MacArthur

1989 Living With Your Conscience Without Going Crazy!

Dr Joel A Freeman
1984 Your conscience as your guide

Peter Toon

1983 Meet your conscience, Back to the Bible

Warren Wiersbe

1973 Let Conscience Speak

David Fountain

1972 Liberty of Conscience

John Van Til

1963 Church and State

J Marcellus Kik

1969 The Pauline use of Suneidesis

NT Studies

1969 Conscience and Responsibility

Eric Mount Jr

1968 The Christian Conscience

Philippe Delahaye

1961 Paul and Seneca

Jan Sevenster

1960 Contemporary Moral Theology

J C Ford and G Kelly

1963 Ethics in a Christian Context

P Lehmannn

1961 Conscience and its right to Freedom

Eric D'Arcy

1956 Christ and Conscience

N H G Robinson
1956 The Voice of Conscience

A M Rehwinkel
1950 Conscience
Ole Hallesby

1927 Conscience and its Problems

Kenneth E Kirk

1917 Conscience and Christ: Six lectures on Christian ethics

H Rashdall

1888 The Christian Conscience: A Contribution on Christian Ethics
W T Davison

1878 Unexplored remainders of Conscience With Preludes on Current Events

Joseph Cook
1838 Conscience considered chiefly in reference to moral and religious obligation

John King
1685 Heaven upon earth

James Durham

1640 The soul's looking glass

William Fenner

1639 Consciences with the power and cases thereof

William Ames

1630 Christian see to thy conscience

Richard Bernard

1626 The anatomy of conscience, or, The sum of Pauls regeneracy

Ephraim Huitt

1608 Whole treatise of the cases of conscience

William Perkins 

Martin Luther 2

Although I lived a blameless life as a monk, I felt that I was a sinner with an uneasy conscience before God. I also could not believe that I had pleased him with my works. Far from loving that righteous God who punished sinners, I actually hated him. I was a good monk, and kept my order so strictly that if ever a monk could get to heaven by monastic discipline, I was that monk. All my companions in the monastery would confirm this. ... And yet my conscience did not give me certainty, but I always doubted and said, "You didn't do that right. You weren't contrite enough. You left that out of your confession."

Jonathan Edwards

Natural conscience consists in these two things.

1. In that disposition to approve or disapprove the moral treatment which passes between us and others, from a determination of the mind to be easy or uneasy, in a consciousness of our being consistent or inconsistent with ourselves. Hereby we have a disposition to approve our own treatment of another, when we are conscious to ourselves that we treat him so as we should expect to be treated by him, were he in our case and we in his; and to disapprove of our own treatment of another, when we are conscious that we should be displeased with the like treatment from him, if we were in his case. So we in our consciences approve of another’s treatment of us, if we are conscious to ourselves, that if we were in his case, and he in ours, we should think it just to treat him as he treats us; and disapprove his treatment of us, when we are conscious that we should think it unjust, if we were in his case. Thus men’s consciences approve or disapprove the sentence of their judge, by which they are acquitted or condemned. But this is not all ... there is another thing that must precede it, and be the foundation of it. ...

2. The other thing which belongs to the approbation or disapprobation of natural conscience, is the sense of desert ... consisting ... in a natural agreement, proportion, and harmony, between malevolence or injury, and resentment and punishment; or between loving and being loved, between showing kindness and being rewarded, &c. Both these kinds of approving or disapproving, concur in the approbation or disapprobation of conscience: the one founded on the other. Thus, when a man’s conscience disapproves of his treatment of his neighbour, in the first place, he is conscious, that if he were in his neighbour’s stead, he should resent such treatment from a sense of justice, or from a sense of uniformity and equality between such treatment, and resentment, and punishment ... And then, in the next place, he perceives, that therefore he is not consistent with himself, in doing what he himself should resent in that case; and hence disapproves it, as being naturally averse to opposition to himself.

Dissertation on the nature of true virtue Chapter 5

Harper Lee

"Atticus, you must be wrong...."

"How's that?"

"Well, most folks seem to think they're right and you're wrong...."

"They're certainly entitled to think that, and they're entitled to full respect for their opinions," said Atticus, "but before I can live with other folks I've got to live with myself. The one thing that doesn't abide by majority rule is a person's conscience."

From To Kill a mockingbird

Charles Buxton

It is astonishing how soon the whole conscience begins to unravel if a single stitch drops. One single sin indulged in makes a hole you could put your head through.
Notes of Thought (No 456)

George Gordon, Lord Byron

Yet still there whispers the small voice within,
Heard through Gain's silence, and o'er Glory's din:
Whatever creed be taught, or land be trod,
Man's conscience is the Oracle of God.
The Island Canto 6

Eddie Cantor

A sleeping pill will never take the place of a clear conscience.

Petrus Forestus

If they be solitary given, superstitious, precise, or very devout: seldom shall you find a merchant, a soldier, an innkeeper, a bawd, a host, a usurer, so troubled in mind, they have cheverel* consciences that will stretch, they are seldom moved in this kind or molested: young men and middle age are more wild and less apprehensive; but old folks, most part, such as are timorous and religiously given.

*soft leather for gloves

Anselm

My conscience dictates to me that I deserve damnation, my repentance will not suffice for satisfaction: but thy mercy, O Lord, quite overcometh all my transgressions.