“There's just ae thing I cannae bear,
An' that's my conscience.”

Speech dissolving the First Protectorate Parliament (22 January 1655)

Spud, "Speedy Recruitment".
Trainspotting (1993)

V, st. 2
The Winding Stair and Other Poems (1933), Vacillation http://poetry.poetryx.com/poems/1751/

Letter to George Richards Minot (June 12, 1789), reported in Fisher Ames, Seth Ames, John Thornton Kirkland, Works of Fisher Ames: With a Selection from His Speeches and Correspondence (1854), p. 54.

Source: Les Misérables

Quoted in "The Bormann Brotherhood" - Page 182 - by William Stevenson - 1973.

1970s, Remarks on pardoning Nixon (1974)
Context: I have come to a decision which I felt I should tell you and all of my fellow American citizens, as soon as I was certain in my own mind and in my own conscience that it is the right thing to do.
I have learned already in this office that the difficult decisions always come to this desk. I must admit that many of them do not look at all the same as the hypothetical questions that I have answered freely and perhaps too fast on previous occasions.
My customary policy is to try and get all the facts and to consider the opinions of my countrymen and to take counsel with my most valued friends. But these seldom agree, and in the end, the decision is mine. To procrastinate, to agonize, and to wait for a more favorable turn of events that may never come or more compelling external pressures that may as well be wrong as right, is itself a decision of sorts and a weak and potentially dangerous course for a President to follow.
I have promised to uphold the Constitution, to do what is right as God gives me to see the right, and to do the very best that I can for America.

Source: Beach Music

Source: How to Kill a Rock Star