“It is reason, principle, conscience, the inhabitant of the breast, the man within, the great judge and arbiter of our conduct.”
Chap. III.
The Theory of Moral Sentiments (1759), Part III
Context: Let us suppose that the great empire of China, with all its myriads of inhabitants, was suddenly swallowed up by an earthquake, and let us consider how a man of humanity in Europe, who had no sort of connection with that part of the world, would be affected upon receiving intelligence of this dreadful calamity. He would, I imagine, first of all, express very strongly his sorrow for the misfortune of that unhappy people, he would make many melancholy reflections upon the precariousness of human life, and the vanity of all the labours of man, which could thus be annihilated in a moment. He would too, perhaps, if he was a man of speculation, enter into many reasonings concerning the effects which this disaster might produce upon the commerce of Europe, and the trade and business of the world in general. And when all this fine philosophy was over, when all these humane sentiments had been once fairly expressed, he would pursue his business or his pleasure, take his repose or his diversion, with the same ease and tranquillity, as if no such accident had happened. The most frivolous disaster which could befall himself would occasion a more real disturbance. If he was to lose his little finger to-morrow, he would not sleep to-night; but, provided he never saw them, he will snore with the most profound security over the ruin of a hundred millions of his brethren, and the destruction of that immense multitude seems plainly an object less interesting to him, than this paltry misfortune of his own. To prevent, therefore, this paltry misfortune to himself, would a man of humanity be willing to sacrifice the lives of a hundred millions of his brethren, provided he had never seen them? Human nature startles with horror at the thought, and the world, in its greatest depravity and corruption, never produced such a villain as could be capable of entertaining it. But what makes this difference? When our passive feelings are almost always so sordid and so selfish, how comes it that our active principles should often be so generous and so noble? When we are always so much more deeply affected by whatever concerns ourselves, than by whatever concerns other men; what is it which prompts the generous, upon all occasions, and the mean upon many, to sacrifice their own interests to the greater interests of others? It is not the soft power of humanity, it is not that feeble spark of benevolence which Nature has lighted up in the human heart, that is thus capable of counteracting the strongest impulses of self-love. It is a stronger power, a more forcible motive, which exerts itself upon such occasions. It is reason, principle, conscience, the inhabitant of the breast, the man within, the great judge and arbiter of our conduct.
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Adam Smith 175
Scottish moral philosopher and political economist 1723–1790Related quotes

Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 121.

“A man's conscience is an unsteady judge of right and wrong.”
Arnas Arnæus
Íslandsklukkan (Iceland's Bell) (1946), Part II: The Fair Maiden
Essai sur la théorie de l'économie politique et de ses rapports avec la morale et le droit. (1867). Quoted by Teotonio R. de Souza in Indo-Portuguese history (1985), p. 210
Essai sur la théorie de l'économie politique et de ses rapports avec la morale et le droit (1867)

“The conscience is the best and most impartial judge that a righteous man has.”
La conciencia es el mejor y más imparcial juez que tiene el hombre de bien.
Letter from Brussels (18 December 1827), quoted in La Rivista de Buenos Aires (1864) edited by Miguel Navarro Viola y Vicente G. Quesada, Vol. 4

Letter to William Charles Jarvis (1820)
1820s
Context: You seem to consider the federal judges as the ultimate arbiters of all constitutional questions, a very dangerous doctrine, indeed, and one which would place us under the despotism of an oligarchy. Our judges are as honest as other men, and not more so. They have with others the same passions for the party, for power and the privilege of the corps. Their power is the more dangerous, as they are in office for life and not responsible, as the other functionaries are, to the elective control. The Constitution has erected no such single tribunal, knowing that to whatever hands confided, with the corruptions of time and party, its members would become despots. It has more wisely made all departments co-equal and co-sovereign within themselves.

In 1948, Address to Sibi Darbar

“Conscience is our unerring judge until we finally stifle it.”
Notre conscience est un juge infaillible, quand nous ne l'avons pas encore assassinée.
The Wild Ass’s Skin (1831), Part II: A Woman Without a Heart

Alledgedly from a speech to the Illinois House of Representatives (18 December 1840) its called "a remarkable piece of spurious Lincolniana" by Merrill D. Peterson: Lincoln in American Memory. Oxford UP 1995, books.google https://books.google.de/books?id=EADk9ZIMJXEC&q=prohibitory#v=page. Cf.Spurious archive.org https://archive.org/details/abrahamlincolnqulinc_41 and Harry Miller Lydenberg: Lincoln and Prohibition, Blazes on a Zigzag Trail. Proceedings Of The American Antiquarian Society, No. 1/1952 pdf http://www.americanantiquarian.org/proceedings/44807229.pdf.
Misattributed