In fact, it could be argued that the very concept of rule of law and sanctity of property are based on the imperfectibility of man.    From Wordnik.com.  [Matthew Yglesias » Organizing Your People] Reference

Reason and will must attempt to make concrete and to put into practice the criterion of God's mishpat, set up by faith, in changing historical situations, always in the essential imperfectibility of man's action within history.    From Wordnik.com.  [Is Economic Justice Possible in this World?] Reference

Just as in our work toward chastity, or any other virtue, so in our work toward social justice, we should be aware of "the essential imperfectibility of man's action within history," but that we are "charged to go toward the Kingdom through justice and love.".    From Wordnik.com.  [Is Economic Justice Possible in this World?] Reference

But these adherents of inherent imperfectibility instance the fact of vanished and variable stars, as well as those that have suddenly appeared, and, after brief periods of intense brilliancy, as suddenly disappeared, to show that there are mighty disturbances in the sidereal heavens which entirely negative the idea of.    From Wordnik.com.  [Life: Its True Genesis] Reference

Any presumed total transformation of social life by reference to some abstract, metaphysical conception of perfect order is rejected as an incoherent and destructive form of utopian perfectibility, which disregards the imperfectibility of human life in its evolving historical contingency and particularity.    From Wordnik.com.  [Darwiniana] Reference

It is instinctive, not theoretical; a disposition, not a doctrine; realistic and sceptical, not grandiose or utopian; accepting of the imperfectibility of man, not restless to overcome it; and seeking to improve the lot of the many not by referring to some plan, but by working with the grain of "the crooked timber of humanity".    From Wordnik.com.  [The Guardian World News] Reference

The countries which abide the most by Enlightenment principles, countries like France, Francophone Belgium, and others, have stagnated the most in recent decades because they are trying to square the actual fact of man’s imperfectibility with a political realm of discourse framed around positive rationalism.    From Wordnik.com.  [Matthew Yglesias » Organizing Your People] Reference

Humboldt thus well refutes the folly of such an imagination: "The imperfectibility of all empirical science, and the boundlessness of the sphere of observation, render the task of explaining the forces of matter by that which is variable in matter, an impracticable one.    From Wordnik.com.  [Fables of Infidelity and Facts of Faith Being an Examination of the Evidences of Infidelity] Reference

The anxious and unfamiliar mother, though not convinced by these abstract sayings of the truth or wisdom of the explanation, takes both for granted; and, giving the nurse credit for more knowledge and experience on this head than she can have, contentedly resigns herself to the infliction, as a thing necessary to be endured for the good of the baby, but thinking it, at the same time, an extraordinary instance of the imperfectibility of Nature as regards the human infant; for her mind wanders to what she has observed in her childhood with puppies and kittens, who, except when rudely torn from their nurse, seldom give utterance to any complaining.    From Wordnik.com.  [The Book of Household Management] Reference