Deepavali or Diwali means "a row of lights". It falls on the last two days of the dark half of Kartik (October-November). For some it is a three-day festival. It commences with the Dhan-Teras, on the 13th day of the dark half of Kartik, followed the next day by the Narak Chaudas, the 14th day, and by Deepavali proper on the 15th day.
There are various alleged origins attributed to this festival. Some hold that they celebrate the marriage of Lakshmi with Lord Vishnu. In Bengal the festival is dedicated to the worship of Kali. It also commemorates that blessed day on which the triumphant Lord Rama returned to Ayodhya after defeating Ravana.
It is believed that on this day Sri Krishna killed the demon Narakasura. This signifies the triumph of justice over evil. Everyone forgets and forgives the wrongs done by others. There is an air of freedom, festivity and friendliness everywhere. This festival brings about unity. It instils charity in the hearts of people. O Ram!
The light of lights, the self-luminous inner light of the Self is ever shining steadily in the chamber of your heart. Sit quietly. Close your eyes. Withdraw the senses. Fix the mind on this supreme light and enjoy the real Deepavali, by attaining illumination of the soul.