When you smile even though your heart is filled with worry, you reduce your suffering and open a door to the way out. Do not hesitate to smile, for inside you there is a kind of energy full of smiles. Beware of surpressing it, for that means that you are strangling yourself with pain and suffering.
It will not harm you if you smile, even if you are talking to others about serious matters from the depths of your heart. How wonderful it is when our lips speak the language of smiles! A westerner once said: "Smiling is a social obligation," and he was right because if you want to mix with people, you have to be nice to them. You have to understand that social life requires human skills at which you have to be proficient, one of which is smiling. This is a social phenomenon which is common to all people.
When you smile at people, you are sharing the beauty of life and the spirit of optimism with them; you are giving them the glad tidings of the best that they can hope for. But if you meet them with a face that is devoid of compassion, you are tormenting them and disturbing them with such an appearance. How can you accept to be the cause of other people's misery?