Sound of Mantra/Japa:
According to Hindu literature the sound of Mantra can lift the believer towards the higher self. These sound elements of Sanskrit language are permanent entities and are of everlasting significance. In the recitation of Sanskrit Mantras the sound is very important, for it can bring transformation in you while leading you to power and strength. Different sounds have different effects on human psyche. If a soft sound of wind rustling through leaves soothes our nerves, the musical note of running stream enchants our heart, thunders may cause awe and fear.
The sacred utterances or chanting of Sanskrit Mantras provide us with the power to attain our goals and lift ourselves from the ordinary to the higher level of consciousness. They give us the power to cure diseases; ward off evils; gain wealth; acquire supernatural powers; worship a deity for exalted communion and for attaining blissful state and attain liberation.
Origin of Mantras:
Mantras have roots into Hindu origin. The teachings of the Vedas consist of various Mantric chants or hymns cognized by different seers or Saints from the Cosmic Mind. Since the Vedas are impersonal and eternal, the exact historical date of the origin of Mantra chanting is hard to arrive at. For example, every Mantra in the Vedas, Upanishads and various religious traditions (sampradayas) within Hindu religion begin with Om or Aum - the primordial sound, the sound that is said to have its origins at the time of the creation of the cosmos - also referred to as the 'Big Bang'.
Mantra Japa was a concept of the Vedic sages that incorporates mantras as one of the main forms of puja, or worship, whose ultimate end is seen as moksha/liberation. Essentially, Mantra Japa means repetition of mantra, and has become an established practice of all Hindu streams, from the various Yoga to Tantra. It involves repetition of a mantra over and over again, usually in cycles of auspicious numbers (in multiples of three), the most popular being 108.
There are many schools of thought on the methods of chanting. A Mantra chanted correctly or incorrectly, knowingly or unknowingly, carefully or carelessly, is sure to bear the desired result for physical and mental well being. At Divyajyot Foundation, Param Pujya Shri Shri Maa offers unique research and insights into "Mantra Shakti/Power". With unique combination of Ayurvedic medicine and Mantra Chanting, it helps in curing diseases such as Cancer. The healing through chanting can be expedited if the mantra is received from a guru. A guru adds a divine potency to the mantra. It becomes more effective and thus helps the chanter in his/her healing faster.
Some of the old and most powerful Mantras include:
ॐ भूर्भुवस्व: |
भर्गो देवस्य धीमहि |
धियो यो न: प्रचोदयात
ॐ पूर्णमदः पूर्णमिदम् पूर्णात् पूर्णमुदच्यते |
पूर्णस्य पूर्णमादाय पूर्णमेवावशिष्यते ||
ॐ शान्तिः शान्तिः शान्तिः || 
ॐ त्र्यम्बकं यजामहे सुगन्धिं पुष्टिवर्धनम् ।
उर्वारुकमिव बन्धनान् मृत्योर्मुक्षीय मामृतात् ॥