A diya or an earthen lamp is synonymous to the festival of Deepavali or Diwali. But it is not just a mere earthen lamp it is much more.
The Diya symbolises knowledge. An ignorant person would often remain in dark and wouldn’t be able to keep a check on the events happening around him. It is only when he feels the need to gain some knowledge that he will realise the purpose of his existence. And hence in this case, a diya/jyot signifies the removal of ignorance through knowledge.
The oil in the diya represents the dirt (greed, jealousy, hatred, lust etc) that humans tend to nurture while the cotton wick is symbolic of the aatman (soul). So in order to attain enlightenment and unite with the Brahman (the supreme power), one must get rid of materialism. A diya emits light when the wick fuelled by oil burns.
The picture credits go to RUCHIR RAKESH. Hope you like it.