“An action, to have moral worth, must be done from duty.”
Book IV, Part 1, Section 1, “The Christian religion as a natural religion”
Religion within the Limits of Reason Alone (1793)
Context: He [Jesus] combines all duties (1) in one universal rule (which includes within itself both the inner and the outer moral relations of men), namely: Perform your duty for no motive other than unconditioned esteem for duty itself, i. e., love God (the Legislator of all duties) above all else; and (2) in a particular rule, that, namely, which concerns man’s external relation to other men as universal duty: Love every one as yourself, i. e., further his welfare from good-will that is immediate and not derived from motives of self-advantage. These commands are not mere laws of virtue but precepts of holiness which we ought to pursue, and the very pursuit of them is called virtue. Accordingly he destroys the hope of all who intend to wait upon this moral goodness quite passively, with their hands in their laps, as though it were a heavenly gift which descends from on high. He who leaves unused the natural predisposition to goodness which lies in human nature (like a talent entrusted to him) in lazy confidence that a higher moral influence will no doubt supply the moral character and completeness which he lacks, is confronted with the threat that even the good which, by virtue of his natural predisposition, he may have done, will not be allowed to stand him in stead because of this neglect (XXV, 29).
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Immanuel Kant 200
German philosopher 1724–1804Related quotes

Source: "Evolutionary Socialism" (1899) https://www.marxists.org/reference/archive/bernstein/works/1899/evsoc/index.htm, Chapter III, The Tasks and Possibilities of Social Democracy

As quoted in "Morarji Desai: The Ascetic Activist" by Lawrence Malkin and William Stewart, in TIME (4 April 1977) http://content.time.com/time/magazine/article/0,9171,947858-2,00.html

“We take, and must continue to take, morally hazardous actions to preserve our civilization.”
The Irony of American History (1952)
Context: We take, and must continue to take, morally hazardous actions to preserve our civilization. We must exercise our power. But we ought neither to believe that a nation is capable of perfect disinterestedness in its exercise, nor become complacent about a particular degree of interest and passion which corrupt the justice by which the exercise of power is legitimatized.

“Thank God, I have done my duty.”
Statement among his final dying words. [citation needed]
The Battle of Trafalgar (1805)

Letter to Thomas Law (13 June 1814)
1810s

Regarding the admission of Orleans Territory as a U.S. State. Abridged Cong. Debates, Jan. 14, 1811. Vol. iv. p. 327. This was later famously paraphrased by Henry Clay: The gentleman [Mr. Quincy] cannot have forgotten his own sentiment, uttered even on the floor of this House, "Peaceably if we can, forcibly if we must." Speech, Jan. 8, 1813.

As quoted in German Thought, From The Seven Years' War To Goethe's Death : Six Lectures (1880) by Karl Hillebrand, p. 207