Indras banner adorned with the square, is the symbolic equivalent of the four square Vajra with which Indra smites the serpent and pins the rock at the dawning of the world. Like the banner, the Diamond thunderbolt was also taken over into Buddhism and there became one of its preeminent symbol and the very foundation of the doctrines of the Vajrayana, the way of the Vajra. The vajra is the multivalent symbol which is clear and transparent like water, it is taken to represent the void, it is the ponder and pestle of knowledge that crushes the defilements of ignorance and passion so as to reveal the eternal and immutable reality of the many Dharmas. It is the weapon hurled to destry the hindrances that block the attainment of the enlightenment, used as indra did to destroy the serpent. It is the lightning flash of awakening, it is the Diamond, indestructible, permanent, and shining like Dharma. Lying beyond worlds or thought, depending on nothing, showing no Dharmas, without beginning, middle or end. Inexhaustible, transcending all imperfections, immutable, incorruptible knowledge of the real is like Vajra, which possesses three surpassing qualities, it is indestructible, it is the most excellent of jewels, and it is the foremost of weapons. Even when it is buried in the mud of Samsara, for innumerable aeons, knowledge is not decayed and never looses its ability to cross the passions, in the same way, the diamond, even though buried in the earth for millennia still remains undecayed and unharmed which is still capable of crushing the encrustations of lust and anger