We weed out the darnel from the corn and the unfit in war, but do not excuse evil men from the service of the state.
Not to unlearn what you have learned is the most necessary kind of learning.
As iron is eaten away by rust, so the envious are consumed by their own passion.
The most useful piece of learning for the uses of life is to unlearn what is untrue.
Wealth and poverty do not lie in a man's estate, but in men's souls.
How to get rid of having anything to unlearn.