According to Hindu mythology, Lord Shivas third eye is a symbol of his spiritual knowledge and power. It is located on his forehead and is usually closed, but when opened, it has the power to destroy everything it sees. There is a story about how Shiva opened his third eye when the god of love and lust, Kamadeva, shot an arrow at Shivas heart. Shiva got disturbed and burnt Kamadeva to ashes with his fiery third eye.

While the third eye is commonly viewed as a symbol of strength and destruction, it is also recognized as the eye of inner wisdom and knowledge by many. It is said that Shivas third eye allows him to see beyond the apparent, something that the other two eyes cannot perceive. According to spiritual beliefs, we all can activate our third eye and therefore achieve enlightenment. The third eye is also known as Gyananakashu.

In summary, if Lord Shiva opens his third eye, it has the power to destroy everything it sees, as seen in the story of Kamadeva. However, the third eye is also a symbol of inner wisdom and knowledge, and activating it can lead to enlightenment.