What is the benefit of saying gayathri mantra?

Gayatri mantra is the most ancient and powerful mantra. Benefits of Gayatri mantra are peace happiness, the fulfillment of desires, destruction of negative karma and sins, improved concentration, success, both physical and mental health, wealth, development of good qualities and pure thoughts, freedom from attachments, spiritual uplifting, prosperity and all round protection from the Goddess. The Gayatri mantra should be initiated by a guru and should be chanted with full faith to reap benefits.