Faults are not the less faults because they are invariably balanced by corresponding virtues, and for a fault there is no excuse, though it may appear greater than it is in many ways. I have never known one who could bear criticism, who could not be flattered, who would not bribe his judge, or was content that the truth should be loved always better than himself.
 Henry David Thoreau, A Week on the Concord and Merrimack Rivers (1849). copy citation

Context

“A want of discernment cannot be an ingredient in it. If I can see my Friend’s virtues more distinctly than another’s, his faults too are made more conspicuous by contrast. We have not so good a right to hate any as our Friend. Faults are not the less faults because they are invariably balanced by corresponding virtues, and for a fault there is no excuse, though it may appear greater than it is in many ways. I have never known one who could bear criticism, who could not be flattered, who would not bribe his judge, or was content that the truth should be loved always better than himself. If two travellers would go their way harmoniously together, the one must take as true and just a view of things as the other, else their path will not be strewn with roses. Yet you can travel profitably and pleasantly even with a blind man, if he practises common courtesy, and when you converse about the scenery will remember that he is blind but that you can see;” source