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.
Authentic love always assumes the mystery of modesty, even in its expression, because actions speak louder than words. Unlike a feigned love, it feels no need to set a conflagration.
In fact the whole passion ordinarily termed love (and heaven help me if I can think of any other term to apply to it) is of such exceeding triviality that I see nothing that I think comparable with it.
The deeper you love yourself, the more the universe will affirm your worth. Then you can enjoy a lifelong love affair that brings you the richest fulfillment from inside out.
I still lack a political, religious and philosophical world view - I change it every month - and so I'll have to limit myself to descriptions of how my heroes love, marry, give birth, die, and how they speak.