Well Idont have any references right now but I can give a few observations about this subject at least...
First of all, when jesus said that about loving your enemies, He had said that we should be perfect as our Father in heaven is perfect... giving rain to the undeserving.
That tells me that loving someone who doesnt love you must be the most difficult thing there is to do... above every other thing. If to do so means to make us perfect as God is perfect. Its easy to love those who are nice to us.
Secondly, I think the way to really do this, at least one way, that is- is to do like Sister White said that Jesus did with Mary. In Desire of Ages it says people just saw Mary as a great sinner, but Jesus saw what she COULD be.
If we realize that every person COULD be a lovable person, a real Christian, ... then we would see them differently and treat them differently. If they did something mean to us or said something mean... we would think of how they could be some day when Jesus was through with them. Then we'd not be looking at the immediate moment or the present hurt they are causing us. We'd realize that if we react kindly to them, we are helping them on the way to becoming that wonderful Christian person. Ministry of healing says that when someone says hurtful things, dont tell them just what you think they deserve. They expect that. Be kind and by doing so, they become ashamed of their behavior and may repent. You'll do this if you realize what they COULD become, instead of thinking of the present hurtful thing that are doing to you.
In answer to what Daryl asked, this is why I think we should love everyone the same, no matter if they are our Brothers and Sisters in Christ or not. They are someone God created and Jesus died for and all someone who could one day turn from being a Saul into a Paul.
Claudia