Our love for others is never that pure. We love for selfish reasons. For example, a man loves a girl partially, if not wholly, because she is attractive to him. If she is not, he'll probably not even look at her, let alone love her. Again, if we like someone as a friend, it's because he or she is fun to be with or can benefit us in some way. Otherwise, we most likely would not bother to know that person. I do admit there are times we feel called to help someone we don't even know in need, but to help someone who is our enemy, that is an entirely different matter. Now, God loves all of us, even if we rebel against him. That love is absolutely unconditional and pure. Only by accepting his love for us ourselves can we possibly love others with a pure love also.