There's a vibratory frequency that corresponds to everything in the Universe. By vibrating a particular combination of sounds, you tune in to various levels of intelligence, or consciousness. Situations, people, and events respond to the signals you send out. The vibratory frequency of a mantra draws to you whatever you are vibrating. You are like a magnet attracting vibrations to you by what you send out.
Chanting mantras, either silently or aloud, is a conscious method of controlling and directing your mind. Happiness or sorrow, joy or regret are vibratory frequencies in the mind. We can call them attitudes, or beliefs, but fundamentally, they are vibratory frequencies or thought waves. They determine the kind of program our mind "plays." Which scenario we choose to hold on to becomes our vibration, defines how we feel and what we project to others. We can exercise our right to choose at any time.
When we chant a mantra we are choosing to invoke the positive power contained in those particular syllables. Whether it's for prosperity, peace of mind, increasing intuition, or any of the other multitude of possible benefits inherent in mantras, simply by chanting them we are setting vibrations into motion that shall have an effect. It doesn't actually matter if we understand the meaning of the sounds or not.
We are creating with every word we speak, and even with every word we think. Words are like boomerangs, every vibration we send out shall come back to us sooner or later. We get what we tune in to.
Your Personal Mantra
Some people think they need a personal mantra. Actually whatever mantra you chant becomes your personal mantra! As the Master of Kundalini Yoga himself has said:
"The word 'mantra' means mental vibration to the infinite mind. It's a direct connection between God and you. Mantra is personal. It affects us personally. Its vibrations are personal. Because, if it is your heartline telephone, and you're dialing it, and you're reaching God, it's not mine, and it's not anybody else's. It's yours." "The conversation of the mind with the soul is the essence of mantra. Mantra means to project and protect the mind. It gives the mind direction. When language and rhythm blend to instill a thought at the deepest level, it is a powerful mantra. It is sacred speech. It is a special use of language.”