Lighting Diya before beginning any activity invites positivity into the ambience. Diyas are a way of increasing the purity and spirituality of our home and mind. While lamps are lit using oil and ghee our tradition prefers ghee diya especially cow ghee lamp over oil during special occasions. According to the Agni Purana lighting Cow Ghee Deepam is supposed to increase the sattvic tattva which includes light bliss and goodness. Sattvic mind is always steady and is blissful internally. It is a practice to light Cows Ghee Diya for health wealth and happiness