Mantra yoga.

Mantra yoga. It has been said, Manana trayate iti mantrah – “By manana (constant thinking or recollection) of which one is released from the cycle of birth and death, that is mantra.” Mantra is that by meditating on which the jiva or individual soul attains freedom from samsara, the phenomenal world. By its aid it attains in full the fourfold fruits: dharma, virtue; artha, wealth; kama, pleasure; and moksha, liberation. A mantra is so called because it is achieved by the mental process. The root "man" in the word mantra means ‘to think’. And "tra" comes from trai meaning ‘to protect’ or ‘to free’ – from the bondage of samsara.
Mantras are in the form of praise and appeal to the deities, craving for help and mercy. Some mantras even control and command evil spirits. By constant repetition of the mantra, the sadhaka imbibes the virtues and powers of the deity that presides over the mantra. You can attain God-realisation by doing japa of any mantra. All mantras have equal potency.
1- Repetition of the Surya mantra bestows health, long life, vigour, vitality and brilliance. It removes all diseases of the body and the eye. No enemy can inflict any harm.
2- Repetition of the Saraswati mantra – Om Shri Saraswatyai Namah – will bestow wisdom and intelligence, and make one a learned person. You will get inspiration and compose poems. You will become a great scholar.
3- Repetition of Om Shri Mahalakshmyai Namah will confer wealth and remove poverty.
4- The Ganesha mantra ~ Om Gan Ganpataya Namah ~ will remove any obstacle in any undertaking. It bestows wisdom, as also psychic powers and wealth.
4- The Mahamrityunjaya mantra will save from accidents, incurable diseases and calamities, and bestow long life and immortality. It is a moksha mantra. Those who practise japa of this mantra daily will enjoy good health and long life, and attain moksha.
5- Repetition of the Subrahmanaya mantra – Om Shri Saravanabhavaya Namah – will give success in any undertaking and make one glorious. It will drive off evil influences and evil spirits.
6- Repetition of the Shri Hanuman mantra – Om Shri Hanumate Namah – will bestow victory and strength.
7- Repetition of the Gayatri, the Pranava, Om Namah Shivaya, Om Namo Narayanaya, Om Namo Bhagavate Vasudevaya, one and a quarter lakh times, with bhava, faith and devotion, will confer mantra siddhi.
8- Om Sri Ramaya Namah, Om Namo Bhagavate Vasudevaya are saguna mantras which will enable you to attain saguna (manifested) realization first, and then nirguna (unmanifested) realization.