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Quotation from The Metaphysical Elements of Ethics by Immanuel Kant
“For it is not possible to man to see so far into the depth of his own heart that he could ever be thoroughly certain of the purity of his moral purpose and the sincerity of his mind even in one single action”
The Metaphysical Elements of Ethics, Introduction, VIII (1)(b), trans. Thomas Kingsmill Abbott
Kant explains why the duty to act from duty is of wide obligation: no one can fully read his own motives.
Citation: "For it is not possible to man to see so far into the depth of his own heart that he could ever be thoroughly certain of the purity of his moral purpose and the sincerity of his mind even in one single action" — Immanuel Kant, The Metaphysical Elements of Ethics, Introduction, VIII (1)(b), trans. Thomas Kingsmill Abbott. (id kant-metaphysical-elements-of-ethics-q4)
