“Like a young eagle who has lent his plume
To fledge the shaft by which he meets his doom,
See their own feathers pluck'd to wing the dart
Which rank corruption destines for their heart.”

Corruption.
Bartlett's Familiar Quotations, 10th ed. (1919)

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Thomas Moore108

Irish poet, singer and songwriter 1779–1852

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“That eagle's fate and mine are one,
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Espied a feather of his own,
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“Twas thine own genius gave the final blow,
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“So in the Libyan fable it is told
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“He who has a false hope, has not that sight of his own corruptions which the saint has.”

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Context: !-- He who has a false hope, has not that sight of his own corruptions which the saint has. A true Christian has ten times more to do with his heart and its corruptions, than a hypocrite: and the sins of his heart and practice, appear to him in their blackness; they look dreadful; and it often appears a very mysterious thing, that any grace can be consistent with such corruption, or should be in such a heart. But a false hope hides corruption, covers it all over, and the hypocrite looks clean and bright in his own eyes.
--> There are two sorts of hypocrites: one that are deceived with their outward morality and external religion; many of which are professed Arminians, in the doctrine of justification: and the other, are those that are deceived with false discoveries and elevations; which often cry down works, and men's own righteousness, and talk much of free grace; but at the same time make a righteousness of their discoveries, and of their humiliation, and exalt themselves to heaven with them. These two kinds of hypocrites, Mr. Shepard, in his Exposition of the Parable of the Ten Virgins, distinguishes by the names of legal and evangelical hypocrites; and often speaks of the latter as the worst. And it is evident that the latter are commonly by far the most confident in their hope, and with the most difficulty brought off from it: I have scarcely known the instance of such a one, in my life, that has been undeceived.