From The Book:
Ignorance, anger, attachment, and pride are the ultimate enemies; they are not outside, but within, and must be fought with the weapons of wisdom and meditative concentration.
It is more useful to be aware of a single weakness in oneself than to be aware of a thousand weaknesses in someone else.
We should remember that if a situation cannot be changed, there is no point in worrying about it. If it can be changed, then there is no need to worry about it either, we should simply go about changing it.