Why Should We Help Our Enemies

Why should we want to help our enemies or to give them happiness? Here are various useful ideas to consider. One approach is to think that the harm they have done us is, in fact, the result of our own past negative actions through which we have set ourselves up as a target for their harm. We could also consider how those who harm us are totally driven by their disturbing emotions.
If someone in our family, someone we love dearly, becomes insane and tries to harm us, we wouldn't think of taking revenge but would try to help them regain a normal state of mind. Living beings, our mothers, are crazed by their disturbing emotions. Those who harm us are in particular need of our love and compassion.
--from The Bodhisattva Vow by Geshe Sonam Rinchen, translated and edited by Ruth Sonam, published by Snow Lion Publications

Our True Enemy

Do you understand who the enemy is? You do not need to beat anyone up, and you do not need a weapon to kill your enemy. You do not need money to buy a weapon. It is all very easy.
How is liberation accomplished? The offering of liberation is accomplished by abandoning the dualistic mind of discursive thoughts. The sharp weapon of primordial wisdom, which completely annihilates the dualistic mind, is the means for achieving this separation. This "weapon" has been part of your continuum for a long time now. With this weapon you can completely devastate the dualistic mind, leaving not even a trace behind, thus liberating the mind into the sphere of unborn truth. The enemy will never return. This is called great liberation.
I must emphasize that primordial wisdom is not something you can buy, get from your best friend or have handed to you by a buddha in heaven. It is not something that someone else has but you do not. Abandon such concepts. Primordial wisdom does not come from an external source. It is simply your true nature. It is something that you and everyone else have as the very essence of your mind.
You should know what your qualities and capabilities are.
--from The Generation Stage in Buddhist Tantra by Gyatrul Rinpoche, published by Snow Lion Publications