One need only reflect a little and he will always find a debt that he has by some means incurred towards the human race (even if it were only this, by the inequality of men in the civil constitution, enjoys advantages on account of which others must be the more in want) , which will prevent the thought of duty from being repressed by the self-complacent imagination of merit.
 Immanuel Kant, Critique of Practical Reason (1788). copy citation

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Author Immanuel Kant
Source Critique of Practical Reason
Topic inequality imagination
Date 1788
Language English
Reference
Note Translated by Thomas Kingsmill Abbott
Weblink http://www.gutenberg.org/cache/epub/5683/pg5683-images.html

Context

“But, in this case, we must fix attention not so much on the elevation of soul, which is very fleeting and transitory, as on the subjection of the heart to duty, from which a more enduring impression may be expected, because this implies principle (whereas the former only implies ebullitions) . One need only reflect a little and he will always find a debt that he has by some means incurred towards the human race (even if it were only this, by the inequality of men in the civil constitution, enjoys advantages on account of which others must be the more in want) , which will prevent the thought of duty from being repressed by the self-complacent imagination of merit. {PART_2|METHODOLOGY ^paragraph 10} But if it is asked: "What, then, is really pure morality, by which as a touchstone we must test the moral significance of every action," then I must admit that it is only philosophers that can make the decision of this question doubtful, for to common sense it has been decided long ago, not indeed by abstract general formulae, but by habitual use, like the distinction between the right and left hand.” source