"He who believes in all those things that are good, will love them, and live in them; he who believes in those things that are impure and selfish, will love them, and cling to them. The tree is known by its fruits."
-Mind is the Master: The complete James Allen Treasury by James Allen
There's love in your heart but that love won't produce a return unless it's geared towards the right things. The love of evil is where love goes to die. The love for good is where it multiplies.
I've always said that I approach religion from a philosophical perspective, that I take in what make sense and leave out what doesn't. Things have to make logical sense for me to assimilate them. Love is an emotion and those are, in their very nature, not rooted in logic however James Allen is able to add structure to these illogical human emotions in a way that make sense to me.
Humans are like batteries with limited energy. Emotions are powered by our energy and we only have so much energy to give it as other parts of our bodies also requires it. It make logical sense to try to save that energy for the things that are more likely to give us a return - to our benefit. The benefit here is, of course, our general wellbeing. By loving the good things over the evil things we are optimizing ourselves in the same way as we do when we exercise or read.
The work required here is to identify the good and evil things in our lives and to give them the proper attention.