Creation exists in layers
We know that on the amavasya of the month of Kartik, Lord Ram returned to Ayodhya, which was marked
We know that on the amavasya of the month of Kartik, Lord Ram returned to Ayodhya, which was marked by lighting of diyas in every house. This is the physical event. What happens in the physical creation is a reflection of that goes around in the world of energy. Creation exists in layers, physical creation that we see around us, is just one layer, which is also the grossest. The subtler layers reveal themselves in the form of colours, sounds, thought and pure energy, as per the state of evolution of being and development of senses.
From energy point of view, the Kartik amavasya or Diwali, is the night of siddhis. It is the night of homecoming of one of the most powerful of forces in universe, the force of Vishnu. Ayodhya, in the case of a sadhak, is the body and lights are the various siddhis, which are ignited in different parts of the body through specific mantras and sadhnas in the sanidhya of a Guru, on the night of Diwali.