Which is the most powerful mantra in the universe?

The Significance of the Gayatri Mantra

The Gayatri mantra is regarded as one of the most profound and universal mantras in Hinduism, calling upon the cosmic Brahman as the source of wisdom and the radiant essence of the primordial Sun. This powerful mantra is derived from the tenth verse of Hymn 62 in Book III of the Rig Veda.