Both Teeth-gritting and Natural Love

Humans are motivated to get what they want, because they want it. Sometimes we can be motivated to do things because of some sort of external force. Perhaps some definition of virtue is "doing what you don't feel like doing". It is virtuous to be self-sacrificing in that way. Allowing an external force to rule over you, or willfully offering yourself to that external force, is virtuous, perhaps the height of virtue. Perhaps as though the real enemy is Self and not any other evil.

The problem with that view is that we may never learn to really want what is good. We tend to value what we desire, and when we value, we love. We have to come to love the good completely someday, and if we have a capacity for "teeth-gritting" love and for "natural" love, we are not fully loving the good if we don't love it naturally. Also, we are more likely to be effective in pursuing the good if both the teeth-gritting and natural sides are working together. To the extent that effectiveness matters in pursuing the good, it is better for us to prefer to have both teeth-gritting and natural love.

So, I do what is good because it is what I want. This is my selfish desire. (There's a sense in which it isn't selfish, if I chose to naturally want to do what is good because it was the right thing to do.)