Though mantras are verbal texts or even could be just a single word, they are considered to have an inherent power that can be brought out only by the repetition by a person, who is pure mentally and physically, and has led a life of strict moral and spiritual discipline. If not repeated with proper discipline, some mantras have been known to cause harm to the person chanting the mantra.
A mantra can be seen as a means to achieve, understand, or perceive something that cannot be perceived by the five senses. It also brings clarity to what can be perceived by the senses, enables one to infer the whole, where only a part can be seen, and dispels all doubts regarding the proper perception of a thing.