There are many shining qualities on the mind of man; but none so useful as discretion. It is this which gives a value to all the rest, and sets them at work in their proper places, and turns them to the advantage of their possessor. Without it, learning is pedantry; wit, impertinence; virtue itself looks like weakness; and the best parts only qualify a man to be more sprightly in errors, and active to his own prejudice. Though a man has all other perfections and wants discretion, he will be of no great consequence in the world; but if he has this single talent in perfection, and but a common share of others, he may do what he pleases in his station of life.
We must avoid here two complementary errors: on the one hand that the world has a unique, intrinsic, pre-existing structure awaiting our grasp; and on the other hand that the world is in utter chaos. The first error is that of the student who marvelled at how the astronomers could find out the true names of distant constellations. The second error is that of the Lewis Carroll's Walrus who grouped shoes with ships and sealing wax, and cabbages with kings...
There are, in every age, new errors to be rectified and new prejudices to be opposed.
Great men's errors are to be venerated as more fruitful than little men's truths.
Perhaps the history of the errors of mankind, all things considered, is more valuable and interesting than that of their discoveries. Truth is uniform and narrow; it constantly exists, and does not seem to require so much an active energy, as a passive aptitude of the soul in order to encounter it. But error is endlessly diversified; it has no reality, but is the pure and simple creation of the mind that invents it. In this field the soul has room enough to expand herself, to display all her boundless faculties, and all her beautiful and interesting extravagancies and absurdities.
It is one of the worst of errors to suppose that there is any path for safety except that of duty.
There are sadistic scientists who hurry to hunt down errors instead of establishing the truth.