“No adolescent ever wants to be understood, which is why they complain about being misunderstood all the time.”

as an advice to Max Planck not to study physics, by Anton Z. Capri, Quips, Quotes and Quanta http://worldscibooks.com/physics/6546.html. World Scientific (2007). p. 1. ISBN 9812709207
a similar advice has been given by Philipp von Jolly, as related by Max Planck in his lecture Vom Relativen zum Absoluten (December 1, 1924).
Disputed

As quoted in Ain't Nobody's Business If You Do" by Peter McWilliams, from 2000 Years of Disbelief (1996) edited by James A Haught p. 817

Encarta http://encarta.msn.com/quote_561556245/Understanding_Being_misunderstood_by_someone_is_vexation.html

¶ 1
State Socialism and Anarchism: How Far They Agree, and Wherin They Differ (1888)
Context: Probably no agitation has ever attained the magnitude, either in the number of its recruits or the area of its influence, which has been attained by Modern Socialism, and at the same time been so little understood and so misunderstood, not only by the hostile and the indifferent, but by the friendly, and even by the great mass of its adherents themselves. This unfortunate and highly dangerous state of things is due partly to the fact that the human relationships which this movement — if anything so chaotic can be called a movement — aims to transform, involve no special class or classes, but literally all mankind; partly to the fact that these relationships are infinitely more varied and complex in their nature than those with which any special reform has ever been called upon to deal; and partly to the fact that the great moulding forces of society, the channels of information and enlightenment, are well-nigh exclusively under the control of those whose immediate pecuniary interests are antagonistic to the bottom claim of Socialism that labor should be put in possession of its own.

Source: The Theory Of Moral Sentiments

Compare Poor Richard's Almanack (1745) : Many complain of their Memory, few of their Judgment.
Introductio ad prudentiam: Part II (1727), Gnomologia (1732)

Comments at the University of Florida (21 October 2005), as quoted in "Coulter courts Gainesville" by Jessica Riffel, in The Alligator (21 October 2005) http://www.alligator.org/pt2/051021coulter.php.
2005
Context: The Democrats complain about the Republican base being nuts … The nuts are their entire party … They're always accusing us of repressing their speech. I say let's do it. Let's repress them. … Frankly, I'm not a big fan of the First Amendment.