I think dealing with a phrase ... phrase you can ignore as long as you like. As far as loving your enemies ... there is no right strategy ... Define an enemy, what kind of enemy, you can be a great strategist and win and crush your enemy totally. Or not and boil with anger for the rest of your life.
There are too many things to list. I love the book "48 Laws of Power" by Robert Greene. He also wrote "33 Strategies of War", which I have not read yet. If you are curious how to deal with enemies ... read it.
Enemies are not created equal. Some enemies are simply to be ignored - don't make them enemies - they are not worth it.
But one example of dealing with enemies is quite striking. At least for me
"The Dalai Lama shows no anger toward the Chinese, even though the policy of the Chinese government for years has been to practice genocide towards Tibetans, cultritude toward their institutions, beliefs, and everything they hold dear, and geocide toward the very land they live on. When asked about his apparent lack of anger toward the Chinese by an incredulous reporter at the time he won the Nobel Peace Prize, the Dalai Lama replied something to the effect that:
"They have taken everything from us; should I let them take my mind as well?"
from "Whenever you go, there you are" by Jon Kabat-Zinn