Love isn’t a state of perfect caring. It is an active noun like struggle. To love someone is to strive to accept that person exactly the way he or she is, right here and now.
If you have only one smile in you, give it to the people you love. Don’t be surly at home, then go out in the street and start grinning ‘Good morning’ at total strangers.
Courtesy, like grace and beauty, that which begets liking and inclination to love one another at the first sight, and in the very beginning of our acquaintance and familiarity; and, consequently, that which first opens the door for us to better ourselves by the example of others, if there be anything in the society worth notice.
Much as we might wish to believe otherwise, universal love and the welfare of the species as a whole are concepts which simply do not make evolutionary sense.