The following quote is from 'The Pocket Thich Nhat Hanh' (click)
and published by 'Shambhala Pocket Classics'.
"If a child smiles, if an adult smiles, that is very important.
If in our daily life we can smile, if we can be peaceful and happy,
not only we, but everyone will profit from it.
This is the most basic kind of peace work.
When I see Tim smiling, I am so happy.
If he is aware that he is making other people happy,
he can say,"You're welcome". "