The most necessary learning is that which unlearns evil.
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.
Quarrels often arise in marriages when the bridal gifts are excessive.
I am sadly afraid that I must have done some wicked thing.
Observe your enemies, for they first find out your faults.
Not to unlearn what you have learned is the most necessary kind of learning.