As iron is eaten by rust, so are the envious consumed by envy.
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 investigation of the meaning of words is the beginning of education.
Pay attention to your enemies, for they are the first to discover your mistakes.
When brothers agree, no fortress is so strong as their common life.
The most useful piece of learning for the uses of life is to unlearn what is untrue.
Quarrels often arise in marriages when the bridal gifts are excessive.