The Dhammapada - 3 & 4

“He abused me, he beat me, 
He defeated me, he robbed me. 
Those, who harbour such thoughts, 
Their hatred is not appeased.”

This verse speaks about the very well known fact, so stressed by the modern psychology. If we succumb to thoughts of injustice done to us, if we always consider ourselves "poor things" that the "strong ones" play with, our suffering and hatred will never disappear, but it will increase, because "they" will feel our insecurity and will enjoy inflicting pain on us even more. "Oh, how could he (or she, for that matter) do this to me? It is so unfair!" By this thinking we will certainly not prevent these things to happen in the future again.

 How to deal with this situation is spoken about in the next verse.

“He abused me, he beat me, 
He defeated me, he robbed me. 
Those, who do not harbour such thoughts, 
Their hatred is appeased.”

This verse is a "twin verse" of the previous one. If we can not conquer the hatred and suffering by crying and feeling powerless, it is exactly by the absence of such thoughts, that our hatred will disappear and dissolve. And when those people who enjoy making us suffer, see that we are not intimidated and do not give in to their way of thinking, they will eventually stop this kind of behavior.

Indeed, it is said very easily and the majority of people will quickly agree with it, but it is extremely difficult to bring this idea to life. Therefore, we must practice this more often in our daily lives -- and our effort must bear its fruits.