The Gayatri Mantra is the most often recited mantra in India. Happiness fills the day of the person who chants and says the mantra every day. In addition, practically everyone uses it and it calms the mind. It is highly well-liked worldwide, not just in India.
The Gayatri Mantra is considered to provide happiness and contentment to the one who says it, as the mantra itself is said to contain the utterance of Om, which also appears in this hymn.