Smile: Life Passport

When we go travel to other countries, we must bring passport. If not, we are not permit to enter.
But in our normal life between people to people. Smile is our passport. With smile we can deal with people smoothly.
In India, there is a famous hotel. The qualification to be staff is to be through a test of smile. Smiling is the important rule of staff standards.
Smile means polite which is so important in the society to deal with people. It is like oil to grease the machine.
When we go to other place, what we see is all strangers. Then we can only smile to pave the way with people.
In family, we shall have a different smile, we only smile in our heart, but peaceful in our outside manner.
It is so important that we must keep a smiling face toward friends and family and to any one we meet.