It is easy to have inner calm when everything is going well in your life. But can you continue to be in happy states of mind when you are faced with difficulties in life? As long as we are alive, we will experience both sorrow and joy.
The reason why people are not happy is because they are in states of mind that are limited. In those states of mind, happiness is fleeting. Your state of mind at any given time will determine how you behave, interpret or react to a situation or person.
This is a good article about finding your peace in the midst of chaos.