How to get rid of having anything to unlearn.
Not to unlearn what you have learned is the most necessary kind of learning.
We must not contradict, but instruct him that contradicts us; for a madman is not cured by another running mad also.
Observe your enemies, for they first find out your faults.
When brothers agree, no fortress is so strong as their common life.
I am sadly afraid that I must have done some wicked thing.