The most necessary learning is that which unlearns evil.
The most useful piece of learning for the uses of life is to unlearn what is untrue.
To all my friends without distinction I am ready to display my opulence: come one, come all; and whosoever likes to take a share is welcome to the wealth that lies within my soul.
The investigation of the meaning of words is the beginning of education.
I am sadly afraid that I must have done some wicked thing.
Not to unlearn what you have learned is the most necessary kind of learning.