I've thought a lot about this - though I tend to focus on "Love your neighbor as yourself", Mt. 22:39.
Loving one's neighbor is incredibly difficult - so much so that we've collectively given up on the concept. Terraforming Mars would be easier. I freely admit that I do not love other people, except for my kid and maybe a few friends. I want to, but I am not able. My job puts me in direct contact with people experiencing homelessness. I am able to do my job, providing food and shelter, but I can't say I love the people I work with. I don't know if that matters to them, but I'm aware of it.
I am still growing, and I pray that God will give me the ability to love my neighbor - and my enemy.