Pay attention to your enemies, for they are the first to discover your mistakes.
Antisthenes (444 - 371 BC)
Contributed by: Zaady
As iron is eaten away by rust, so the envious are consumed by their own passion.
It is better to fall among crows than flatterers; for those devour only the dead - these the living.
Not to unlearn what you have learned is the most necessary kind of learning.
Source: The Lives and Opinions of Eminent Philosophers, by Diogenes Laertius, translated by C.D. Yonge
On being praised by some wicked men, I am sadly afraid that I must have done some wicked thing.
The most useful piece of learning for the uses of life is to unlearn what is untrue.
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